diff --git a/hello_wolf/factor_bearing.h b/hello_wolf/factor_bearing.h
index ce6bb49fe75e5200c1824f7f496e6f96d9c55131..5c958ba175327d9ae30061ec71605996561505f4 100644
--- a/hello_wolf/factor_bearing.h
+++ b/hello_wolf/factor_bearing.h
@@ -5,8 +5,8 @@
  *      Author: jsola
  */
 
-#ifndef HELLO_WOLF_CONSTRAINT_BEARING_H_
-#define HELLO_WOLF_CONSTRAINT_BEARING_H_
+#ifndef HELLO_WOLF_FACTOR_BEARING_H_
+#define HELLO_WOLF_FACTOR_BEARING_H_
 
 #include "base/factor/factor_autodiff.h"
 
@@ -88,4 +88,4 @@ inline bool FactorBearing::operator ()(const T* const _p1, const T* const _o1,
 
 } // namespace wolf
 
-#endif /* HELLO_WOLF_CONSTRAINT_BEARING_H_ */
+#endif /* HELLO_WOLF_FACTOR_BEARING_H_ */
diff --git a/hello_wolf/factor_range_bearing.h b/hello_wolf/factor_range_bearing.h
index 727e75a4e07ef3b696bb4075f016677d307320ba..1414d61a20252cd76402af416e4a484812d57c8a 100644
--- a/hello_wolf/factor_range_bearing.h
+++ b/hello_wolf/factor_range_bearing.h
@@ -5,8 +5,8 @@
  *      \author: jsola
  */
 
-#ifndef HELLO_WOLF_CONSTRAINT_RANGE_BEARING_H_
-#define HELLO_WOLF_CONSTRAINT_RANGE_BEARING_H_
+#ifndef HELLO_WOLF_FACTOR_RANGE_BEARING_H_
+#define HELLO_WOLF_FACTOR_RANGE_BEARING_H_
 
 #include "base/factor/factor_autodiff.h"
 
@@ -132,4 +132,4 @@ inline bool FactorRangeBearing::operator ()(const T* const _p_w_r, // robot posi
 }
 
 } // namespace wolf
-#endif /* HELLO_WOLF_CONSTRAINT_RANGE_BEARING_H_ */
+#endif /* HELLO_WOLF_FACTOR_RANGE_BEARING_H_ */
diff --git a/hello_wolf/processor_range_bearing.cpp b/hello_wolf/processor_range_bearing.cpp
index cb72112ee66434532e6c85365088f35aab4b1251..25d7fd4067c2401b46db2c247961b54a8213f71f 100644
--- a/hello_wolf/processor_range_bearing.cpp
+++ b/hello_wolf/processor_range_bearing.cpp
@@ -89,7 +89,7 @@ void ProcessorRangeBearing::process(CaptureBasePtr _capture)
                                                             lmk,
                                                             prc,
                                                             false,
-                                                            CTR_ACTIVE);
+                                                            FAC_ACTIVE);
         ftr->addFactor(ctr);
         lmk->addConstrainedBy(ctr);
     }
diff --git a/include/base/capture/capture_base.h b/include/base/capture/capture_base.h
index f9e4abe9e1fff5b6852e12bbb5acaf196b6ca11f..7643f243ea4b8a05e0acdad82eb4454a8e87a6c4 100644
--- a/include/base/capture/capture_base.h
+++ b/include/base/capture/capture_base.h
@@ -66,13 +66,13 @@ class CaptureBase : public NodeBase, public std::enable_shared_from_this<Capture
         FeatureBasePtrList& getFeatureList();
         void addFeatureList(FeatureBasePtrList& _new_ft_list);
 
-        void getFactorList(FactorBasePtrList& _ctr_list);
+        void getFactorList(FactorBasePtrList& _fac_list);
 
         SensorBasePtr getSensor() const;
         virtual void setSensorPtr(const SensorBasePtr sensor_ptr);
 
         // constrained by
-        virtual FactorBasePtr addConstrainedBy(FactorBasePtr _ctr_ptr);
+        virtual FactorBasePtr addConstrainedBy(FactorBasePtr _fac_ptr);
         unsigned int getHits() const;
         FactorBasePtrList& getConstrainedByList();
 
diff --git a/include/base/ceres_wrapper/create_numeric_diff_cost_function.h b/include/base/ceres_wrapper/create_numeric_diff_cost_function.h
index 967cf1d5ea73fd4692ffe603372868857cf915c7..fafa62aae9d0fae3f0a26e4bc08816dc33b9e73b 100644
--- a/include/base/ceres_wrapper/create_numeric_diff_cost_function.h
+++ b/include/base/ceres_wrapper/create_numeric_diff_cost_function.h
@@ -28,17 +28,17 @@ std::shared_ptr<ceres::NumericDiffCostFunction<T, ceres::CENTRAL, T::residualSiz
                                                            T::block5Size,T::block6Size,T::block7Size,T::block8Size,T::block9Size> >(std::static_pointer_cast<T>(_factor_ptr).get());
 };
 
-inline std::shared_ptr<ceres::CostFunction> createNumericDiffCostFunction(FactorBasePtr _ctr_ptr)
+inline std::shared_ptr<ceres::CostFunction> createNumericDiffCostFunction(FactorBasePtr _fac_ptr)
 {
-//    switch (_ctr_ptr->getTypeId())
+//    switch (_fac_ptr->getTypeId())
 //    {
 //        // just for testing
-//        case CTR_ODOM_2D:
-//            return createNumericDiffCostFunctionCeres<FactorOdom2D>(_ctr_ptr);
+//        case FAC_ODOM_2D:
+//            return createNumericDiffCostFunctionCeres<FactorOdom2D>(_fac_ptr);
 //
 //        /* For adding a new factor, add the #include and a case:
-//        case CTR_ENUM:
-//            return createNumericDiffCostFunctionCeres<FactorType>(_ctr_ptr);
+//        case FAC_ENUM:
+//            return createNumericDiffCostFunctionCeres<FactorType>(_fac_ptr);
 //         */
 //
 //        default:
diff --git a/include/base/factor/factor_AHP.h b/include/base/factor/factor_AHP.h
index 3c5ac2af1eea382a194f9a43e0de56b5e96a540c..a6448b06458658949bff014aa93da139f74f0e83 100644
--- a/include/base/factor/factor_AHP.h
+++ b/include/base/factor/factor_AHP.h
@@ -190,9 +190,9 @@ inline FactorAHPPtr FactorAHP::create(const FeatureBasePtr&   _ftr_ptr,
                                               FactorStatus _status)
 {
     // construct factor
-    FactorAHPPtr ctr_ahp = std::make_shared<FactorAHP>(_ftr_ptr, _lmk_ahp_ptr, _processor_ptr, _apply_loss_function, _status);
+    FactorAHPPtr fac_ahp = std::make_shared<FactorAHP>(_ftr_ptr, _lmk_ahp_ptr, _processor_ptr, _apply_loss_function, _status);
 
-    return ctr_ahp;
+    return fac_ahp;
 }
 
 } // namespace wolf
diff --git a/include/base/factor/factor_GPS_2D.h b/include/base/factor/factor_GPS_2D.h
index b34e7c06ebf81628ca7423357495fbb69fa11b21..a3ce0e60979b6241fbf2d4f871543764430c8015 100644
--- a/include/base/factor/factor_GPS_2D.h
+++ b/include/base/factor/factor_GPS_2D.h
@@ -1,6 +1,6 @@
 
-#ifndef CONSTRAINT_GPS_2D_H_
-#define CONSTRAINT_GPS_2D_H_
+#ifndef FACTOR_GPS_2D_H_
+#define FACTOR_GPS_2D_H_
 
 //Wolf includes
 #include "base/wolf.h"
@@ -15,7 +15,7 @@ class FactorGPS2D : public FactorAutodiff<FactorGPS2D, 2, 2>
 {
     public:
 
-        FactorGPS2D(FeatureBasePtr _ftr_ptr, bool _apply_loss_function = false, FactorStatus _status = CTR_ACTIVE) :
+        FactorGPS2D(FeatureBasePtr _ftr_ptr, bool _apply_loss_function = false, FactorStatus _status = FAC_ACTIVE) :
             FactorAutodiff<FactorGPS2D, 2, 2>("GPS 2D", nullptr, nullptr, nullptr, nullptr, nullptr, _apply_loss_function, _status, _ftr_ptr->getFrame()->getP())
         {
             //
diff --git a/include/base/factor/factor_GPS_pseudorange_2D.h b/include/base/factor/factor_GPS_pseudorange_2D.h
index 40b8a5115392bcfbce961f45e6abde8dbb92417e..82b186fc65e43f124bf1fd9e4f905b4d14928379 100644
--- a/include/base/factor/factor_GPS_pseudorange_2D.h
+++ b/include/base/factor/factor_GPS_pseudorange_2D.h
@@ -1,5 +1,5 @@
-#ifndef CONSTRAINT_GPS_PSEUDORANGE_2D_H_
-#define CONSTRAINT_GPS_PSEUDORANGE_2D_H_
+#ifndef FACTOR_GPS_PSEUDORANGE_2D_H_
+#define FACTOR_GPS_PSEUDORANGE_2D_H_
 
 #define LIGHT_SPEED_ 299792458
 
@@ -29,7 +29,7 @@ class FactorGPSPseudorange2D : public FactorAutodiff<FactorGPSPseudorange2D, 1,
     public:
         FactorGPSPseudorange2D(const FeatureBasePtr& _ftr_ptr, const ProcessorBasePtr& _pr_ptr,
                                    bool _apply_loss_function = false, 
-                                   FactorStatus _status = CTR_ACTIVE) :
+                                   FactorStatus _status = FAC_ACTIVE) :
            FactorAutodiff<FactorGPSPseudorange2D, 1, 2, 1, 3, 1, 3, 1>("GPS PR 2D",
                                                                                nullptr,
                                                                                nullptr,
@@ -238,4 +238,4 @@ inline bool FactorGPSPseudorange2D::operator ()(const T* const _vehicle_p, const
 
 } // namespace wolf
 
-#endif //CONSTRAINT_GPS_PSEUDORANGE_2D_H_
+#endif //FACTOR_GPS_PSEUDORANGE_2D_H_
diff --git a/include/base/factor/factor_GPS_pseudorange_3D.h b/include/base/factor/factor_GPS_pseudorange_3D.h
index d7a33681c7fde08bea6e2d086aa30364149eba2e..72e44d4f62f55358e33cf2ebb14254ca532f1bd3 100644
--- a/include/base/factor/factor_GPS_pseudorange_3D.h
+++ b/include/base/factor/factor_GPS_pseudorange_3D.h
@@ -1,5 +1,5 @@
-#ifndef CONSTRAINT_GPS_PSEUDORANGE_3D_H_
-#define CONSTRAINT_GPS_PSEUDORANGE_3D_H_
+#ifndef FACTOR_GPS_PSEUDORANGE_3D_H_
+#define FACTOR_GPS_PSEUDORANGE_3D_H_
 
 #define LIGHT_SPEED 299792458
 
@@ -28,7 +28,7 @@ class FactorGPSPseudorange3D: public FactorAutodiff<FactorGPSPseudorange3D, 1, 3
 
         FactorGPSPseudorange3D(FeatureBasePtr _ftr_ptr, const ProcessorBasePtr& _pr_ptr,
                                    bool _apply_loss_function = false, 
-                                   FactorStatus _status = CTR_ACTIVE) :
+                                   FactorStatus _status = FAC_ACTIVE) :
              FactorAutodiff<FactorGPSPseudorange3D, 1, 3, 4, 3, 1, 3, 4>("GPS PR 3D",
                                                                                  nullptr, nullptr, nullptr, nullptr, _pr_ptr, _apply_loss_function, _status,
                             _ftr_ptr->getFrame()->getP(), // position of the vehicle's frame with respect to map frame
@@ -138,4 +138,4 @@ inline bool FactorGPSPseudorange3D::operator ()(const T* const _vehicle_p, const
 
 } // namespace wolf
 
-#endif //CONSTRAINT_GPS_PSEUDORANGE_3D_H_
+#endif //FACTOR_GPS_PSEUDORANGE_3D_H_
diff --git a/include/base/factor/factor_IMU.h b/include/base/factor/factor_IMU.h
index c1b9ba65a9026bed9b9f4ca1a32365b02bbcac0a..fbb29d1642e91d9fe90f55da673f3b8a87b6c335 100644
--- a/include/base/factor/factor_IMU.h
+++ b/include/base/factor/factor_IMU.h
@@ -1,5 +1,5 @@
-#ifndef CONSTRAINT_IMU_THETA_H_
-#define CONSTRAINT_IMU_THETA_H_
+#ifndef FACTOR_IMU_THETA_H_
+#define FACTOR_IMU_THETA_H_
 
 //Wolf includes
 #include "base/feature/feature_IMU.h"
@@ -21,7 +21,7 @@ class FactorIMU : public FactorAutodiff<FactorIMU, 15, 3, 4, 3, 6, 3, 4, 3, 6>
                       const CaptureIMUPtr& _capture_origin_ptr,
                       const ProcessorBasePtr& _processor_ptr = nullptr,
                       bool _apply_loss_function = false,
-                      FactorStatus _status = CTR_ACTIVE);
+                      FactorStatus _status = FAC_ACTIVE);
 
         virtual ~FactorIMU() = default;
 
diff --git a/include/base/factor/factor_diff_drive.h b/include/base/factor/factor_diff_drive.h
index 89a54a3c111bc779d8560cbd2df32d538c4bdf98..b495859c7409031153025fe507c0f10113c92a54 100644
--- a/include/base/factor/factor_diff_drive.h
+++ b/include/base/factor/factor_diff_drive.h
@@ -5,8 +5,8 @@
  *  \author: Jeremie Deray
  */
 
-#ifndef WOLF_CONSTRAINT_DIFF_DRIVE_H_
-#define WOLF_CONSTRAINT_DIFF_DRIVE_H_
+#ifndef WOLF_FACTOR_DIFF_DRIVE_H_
+#define WOLF_FACTOR_DIFF_DRIVE_H_
 
 //Wolf includes
 #include "base/factor/factor_autodiff.h"
@@ -43,7 +43,7 @@ public:
                       const CaptureWheelJointPositionPtr& _capture_origin_ptr,
                       const ProcessorBasePtr& _processor_ptr = nullptr,
                       const bool _apply_loss_function = false,
-                      const FactorStatus _status = CTR_ACTIVE) :
+                      const FactorStatus _status = FAC_ACTIVE) :
     Base("DIFF DRIVE", _capture_origin_ptr->getFrame(), _capture_origin_ptr,
          nullptr, nullptr, _processor_ptr,
          _apply_loss_function, _status,
@@ -136,4 +136,4 @@ FactorDiffDrive::operator ()(const T* const _p1, const T* const _o1, const T* co
 
 } // namespace wolf
 
-#endif /* WOLF_CONSTRAINT_DIFF_DRIVE_H_ */
+#endif /* WOLF_FACTOR_DIFF_DRIVE_H_ */
diff --git a/include/base/factor/factor_epipolar.h b/include/base/factor/factor_epipolar.h
index 075fa9203d8140be27d10322fe1251fd4ff2c80f..42f0e855894c6f247ef30f15c77508157824fb68 100644
--- a/include/base/factor/factor_epipolar.h
+++ b/include/base/factor/factor_epipolar.h
@@ -1,5 +1,5 @@
-#ifndef CONSTRAINT_EPIPOLAR_H
-#define CONSTRAINT_EPIPOLAR_H
+#ifndef FACTOR_EPIPOLAR_H
+#define FACTOR_EPIPOLAR_H
 
 #include "base/factor/factor_base.h"
 
@@ -15,7 +15,7 @@ class FactorEpipolar : public FactorBase
                            const FeatureBasePtr& _feature_other_ptr,
                            const ProcessorBasePtr& _processor_ptr = nullptr,
                            bool _apply_loss_function = false,
-                           FactorStatus _status = CTR_ACTIVE);
+                           FactorStatus _status = FAC_ACTIVE);
 
         virtual ~FactorEpipolar() = default;
 
@@ -66,4 +66,4 @@ inline FactorBasePtr FactorEpipolar::create(const FeatureBasePtr& _feature_ptr,
 
 } // namespace wolf
 
-#endif // CONSTRAINT_EPIPOLAR_H
+#endif // FACTOR_EPIPOLAR_H
diff --git a/include/base/factor/factor_fix_bias.h b/include/base/factor/factor_fix_bias.h
index c34ff5bd0b56b885b7512a9a3e26d91f2f25b49e..6c1f321dc0f7fcaf965476dc802080e3d3bb23b5 100644
--- a/include/base/factor/factor_fix_bias.h
+++ b/include/base/factor/factor_fix_bias.h
@@ -1,6 +1,6 @@
 
-#ifndef CONSTRAINT_FIX_BIAS_H_
-#define CONSTRAINT_FIX_BIAS_H_
+#ifndef FACTOR_FIX_BIAS_H_
+#define FACTOR_FIX_BIAS_H_
 
 //Wolf includes
 #include "base/capture/capture_IMU.h"
@@ -19,7 +19,7 @@ WOLF_PTR_TYPEDEFS(FactorFixBias);
 class FactorFixBias: public FactorAutodiff<FactorFixBias,6,3,3>
 {
     public:
-        FactorFixBias(FeatureBasePtr _ftr_ptr, bool _apply_loss_function = false, FactorStatus _status = CTR_ACTIVE) :
+        FactorFixBias(FeatureBasePtr _ftr_ptr, bool _apply_loss_function = false, FactorStatus _status = FAC_ACTIVE) :
                 FactorAutodiff<FactorFixBias, 6, 3, 3>("FIX BIAS",
                         nullptr, nullptr, nullptr, nullptr, nullptr, _apply_loss_function, _status, std::static_pointer_cast<CaptureIMU>(_ftr_ptr->getCapture())->getAccBias(),
                                           std::static_pointer_cast<CaptureIMU>(_ftr_ptr->getCapture())->getGyroBias())
diff --git a/include/base/factor/factor_odom_2D.h b/include/base/factor/factor_odom_2D.h
index 3413791a5663994ad79122e11a19b02e97174f7f..e45570d79a8debe284310998cc87f48032521a10 100644
--- a/include/base/factor/factor_odom_2D.h
+++ b/include/base/factor/factor_odom_2D.h
@@ -1,5 +1,5 @@
-#ifndef CONSTRAINT_ODOM_2D_THETA_H_
-#define CONSTRAINT_ODOM_2D_THETA_H_
+#ifndef FACTOR_ODOM_2D_THETA_H_
+#define FACTOR_ODOM_2D_THETA_H_
 
 //Wolf includes
 #include "base/factor/factor_autodiff.h"
@@ -18,7 +18,7 @@ class FactorOdom2D : public FactorAutodiff<FactorOdom2D, 3, 2, 1, 2, 1>
         FactorOdom2D(const FeatureBasePtr& _ftr_ptr,
                          const FrameBasePtr& _frame_other_ptr,
                          const ProcessorBasePtr& _processor_ptr = nullptr,
-                         bool _apply_loss_function = false, FactorStatus _status = CTR_ACTIVE) :
+                         bool _apply_loss_function = false, FactorStatus _status = FAC_ACTIVE) :
              FactorAutodiff<FactorOdom2D, 3, 2, 1, 2, 1>("ODOM 2D",
                                                                  _frame_other_ptr, nullptr, nullptr, nullptr,
                                                                  _processor_ptr,
diff --git a/include/base/factor/factor_odom_2D_analytic.h b/include/base/factor/factor_odom_2D_analytic.h
index b19757ce59c8abe0206335d0cb5ff64161084e86..2eb3296240c9b28766919748875eaea9720d87e0 100644
--- a/include/base/factor/factor_odom_2D_analytic.h
+++ b/include/base/factor/factor_odom_2D_analytic.h
@@ -1,5 +1,5 @@
-#ifndef CONSTRAINT_ODOM_2D_ANALYTIC_H_
-#define CONSTRAINT_ODOM_2D_ANALYTIC_H_
+#ifndef FACTOR_ODOM_2D_ANALYTIC_H_
+#define FACTOR_ODOM_2D_ANALYTIC_H_
 
 //Wolf includes
 #include "base/factor/factor_relative_2D_analytic.h"
@@ -17,7 +17,7 @@ class FactorOdom2DAnalytic : public FactorRelative2DAnalytic
                                  const FrameBasePtr& _frame_ptr,
                                  const ProcessorBasePtr& _processor_ptr = nullptr,
                                  bool _apply_loss_function = false,
-                                 FactorStatus _status = CTR_ACTIVE) :
+                                 FactorStatus _status = FAC_ACTIVE) :
             FactorRelative2DAnalytic("ODOM_2D", _ftr_ptr,
                                          _frame_ptr, _processor_ptr, _apply_loss_function, _status)
         {
diff --git a/include/base/factor/factor_odom_3D.h b/include/base/factor/factor_odom_3D.h
index ec14e38065c8bdc2f5d041a47395b86ddc70bbb1..ce3456ef0e8c286c7b082a79a41fa268e4608a8e 100644
--- a/include/base/factor/factor_odom_3D.h
+++ b/include/base/factor/factor_odom_3D.h
@@ -5,8 +5,8 @@
  *      Author: jsola
  */
 
-#ifndef CONSTRAINT_ODOM_3D_H_
-#define CONSTRAINT_ODOM_3D_H_
+#ifndef FACTOR_ODOM_3D_H_
+#define FACTOR_ODOM_3D_H_
 
 #include "base/factor/factor_autodiff.h"
 #include "base/rotations.h"
@@ -24,7 +24,7 @@ class FactorOdom3D : public FactorAutodiff<FactorOdom3D,6,3,4,3,4>
                          const FrameBasePtr& _frame_past_ptr,
                          const ProcessorBasePtr& _processor_ptr = nullptr,
                          bool _apply_loss_function = false,
-                         FactorStatus _status = CTR_ACTIVE);
+                         FactorStatus _status = FAC_ACTIVE);
 
         virtual ~FactorOdom3D() = default;
 
@@ -228,4 +228,4 @@ inline bool FactorOdom3D::operator ()(const T* const _p_current, const T* const
 
 } /* namespace wolf */
 
-#endif /* CONSTRAINT_ODOM_3D_H_ */
+#endif /* FACTOR_ODOM_3D_H_ */
diff --git a/include/base/factor/factor_point_2D.h b/include/base/factor/factor_point_2D.h
index 16ed524719d7fe234333285517f015cb321f1991..2034260de9483f592e54de2a1e3f125a12c19879 100644
--- a/include/base/factor/factor_point_2D.h
+++ b/include/base/factor/factor_point_2D.h
@@ -1,5 +1,5 @@
-#ifndef CONSTRAINT_POINT_2D_THETA_H_
-#define CONSTRAINT_POINT_2D_THETA_H_
+#ifndef FACTOR_POINT_2D_THETA_H_
+#define FACTOR_POINT_2D_THETA_H_
 
 //Wolf includes
 #include "base/factor/factor_autodiff.h"
@@ -28,7 +28,7 @@ class FactorPoint2D: public FactorAutodiff<FactorPoint2D, 2,2,1,2,1,2>
     FactorPoint2D(const FeaturePolyline2DPtr& _ftr_ptr,
                       const LandmarkPolyline2DPtr& _lmk_ptr,
                       const ProcessorBasePtr& _processor_ptr,
-                      unsigned int _ftr_point_id, int _lmk_point_id, bool _apply_loss_function = false, FactorStatus _status = CTR_ACTIVE) :
+                      unsigned int _ftr_point_id, int _lmk_point_id, bool _apply_loss_function = false, FactorStatus _status = FAC_ACTIVE) :
         FactorAutodiff<FactorPoint2D,2,2,1,2,1,2>("POINT 2D",
                 nullptr, nullptr, nullptr, _lmk_ptr, _processor_ptr, _apply_loss_function, _status, _ftr_ptr->getFrame()->getP(), _ftr_ptr->getFrame()->getO(), _lmk_ptr->getP(), _lmk_ptr->getO(), _lmk_ptr->getPointStateBlockPtr(_lmk_point_id)),
         feature_point_id_(_ftr_point_id), landmark_point_id_(_lmk_point_id), point_state_ptr_(_lmk_ptr->getPointStateBlockPtr(_lmk_point_id)), measurement_(_ftr_ptr->getPoints().col(_ftr_point_id)), measurement_covariance_(_ftr_ptr->getPointsCov().middleCols(_ftr_point_id*2,2))
diff --git a/include/base/factor/factor_point_to_line_2D.h b/include/base/factor/factor_point_to_line_2D.h
index 239fdc62b91330da88f6c04915eaed24b7de1641..e60c8d3c7ef2677637cb06d86a832064fdaa44ce 100644
--- a/include/base/factor/factor_point_to_line_2D.h
+++ b/include/base/factor/factor_point_to_line_2D.h
@@ -1,5 +1,5 @@
-#ifndef CONSTRAINT_POINT_TO_LINE_2D_H_
-#define CONSTRAINT_POINT_TO_LINE_2D_H_
+#ifndef FACTOR_POINT_TO_LINE_2D_H_
+#define FACTOR_POINT_TO_LINE_2D_H_
 
 //Wolf includes
 #include "base/factor/factor_autodiff.h"
@@ -29,7 +29,7 @@ class FactorPointToLine2D: public FactorAutodiff<FactorPointToLine2D, 1,2,1,2,1,
                             const LandmarkPolyline2DPtr& _lmk_ptr,
                             const ProcessorBasePtr& _processor_ptr,
                             unsigned int _ftr_point_id, int _lmk_point_id,  int _lmk_point_aux_id,
-                            bool _apply_loss_function = false, FactorStatus _status = CTR_ACTIVE) :
+                            bool _apply_loss_function = false, FactorStatus _status = FAC_ACTIVE) :
         FactorAutodiff<FactorPointToLine2D, 1,2,1,2,1,2,2>("POINT TO LINE 2D",
                 nullptr, nullptr, nullptr, _lmk_ptr, _processor_ptr, _apply_loss_function, _status, _ftr_ptr->getFrame()->getP(), _ftr_ptr->getFrame()->getO(), _lmk_ptr->getP(), _lmk_ptr->getO(), _lmk_ptr->getPointStateBlockPtr(_lmk_point_id), _lmk_ptr->getPointStateBlockPtr(_lmk_point_aux_id)),
         landmark_point_id_(_lmk_point_id), landmark_point_aux_id_(_lmk_point_aux_id), feature_point_id_(_ftr_point_id), point_state_ptr_(_lmk_ptr->getPointStateBlockPtr(_lmk_point_id)), point_aux_state_ptr_(_lmk_ptr->getPointStateBlockPtr(_lmk_point_aux_id)), measurement_(_ftr_ptr->getPoints().col(_ftr_point_id)), measurement_covariance_(_ftr_ptr->getPointsCov().middleCols(_ftr_point_id*2,2))
diff --git a/include/base/factor/factor_pose_2D.h b/include/base/factor/factor_pose_2D.h
index 93397ae4a3858dc6b246215b4cb87e5387083e62..306b5e15ebf9e2e67eb41c8e5072aa050f7d6b32 100644
--- a/include/base/factor/factor_pose_2D.h
+++ b/include/base/factor/factor_pose_2D.h
@@ -1,6 +1,6 @@
 
-#ifndef CONSTRAINT_POSE_2D_H_
-#define CONSTRAINT_POSE_2D_H_
+#ifndef FACTOR_POSE_2D_H_
+#define FACTOR_POSE_2D_H_
 
 //Wolf includes
 #include "base/factor/factor_autodiff.h"
@@ -17,7 +17,7 @@ WOLF_PTR_TYPEDEFS(FactorPose2D);
 class FactorPose2D: public FactorAutodiff<FactorPose2D,3,2,1>
 {
     public:
-        FactorPose2D(FeatureBasePtr _ftr_ptr, bool _apply_loss_function = false, FactorStatus _status = CTR_ACTIVE) :
+        FactorPose2D(FeatureBasePtr _ftr_ptr, bool _apply_loss_function = false, FactorStatus _status = FAC_ACTIVE) :
                 FactorAutodiff<FactorPose2D, 3, 2, 1>("POSE 2D", nullptr, nullptr, nullptr, nullptr, nullptr,_apply_loss_function, _status, _ftr_ptr->getFrame()->getP(), _ftr_ptr->getFrame()->getO())
         {
 //            std::cout << "created FactorPose2D " << std::endl;
diff --git a/include/base/factor/factor_pose_3D.h b/include/base/factor/factor_pose_3D.h
index e53137aa039b27c6157b7e049c9ddca5b2286a60..b9c4da39516235081a4ec91334fa06958478264c 100644
--- a/include/base/factor/factor_pose_3D.h
+++ b/include/base/factor/factor_pose_3D.h
@@ -1,6 +1,6 @@
 
-#ifndef CONSTRAINT_POSE_3D_H_
-#define CONSTRAINT_POSE_3D_H_
+#ifndef FACTOR_POSE_3D_H_
+#define FACTOR_POSE_3D_H_
 
 //Wolf includes
 #include "base/factor/factor_autodiff.h"
@@ -16,7 +16,7 @@ class FactorPose3D: public FactorAutodiff<FactorPose3D,6,3,4>
 {
     public:
 
-        FactorPose3D(FeatureBasePtr _ftr_ptr, bool _apply_loss_function = false, FactorStatus _status = CTR_ACTIVE) :
+        FactorPose3D(FeatureBasePtr _ftr_ptr, bool _apply_loss_function = false, FactorStatus _status = FAC_ACTIVE) :
             FactorAutodiff<FactorPose3D,6,3,4>("POSE 3D", nullptr, nullptr, nullptr, nullptr, nullptr, _apply_loss_function, _status, _ftr_ptr->getFrame()->getP(), _ftr_ptr->getFrame()->getO())
         {
             //
diff --git a/include/base/factor/factor_quaternion_absolute.h b/include/base/factor/factor_quaternion_absolute.h
index 89fc55e72c1ff0ae04a3a872371a83abf718fad9..1864a6c8eede4bd07190c4da737a7e1f25da117f 100644
--- a/include/base/factor/factor_quaternion_absolute.h
+++ b/include/base/factor/factor_quaternion_absolute.h
@@ -5,8 +5,8 @@
  *      \author: AtDinesh
  */
 
-#ifndef CONSTRAINT_QUATERNION_ABSOLUTE_H_
-#define CONSTRAINT_QUATERNION_ABSOLUTE_H_
+#ifndef FACTOR_QUATERNION_ABSOLUTE_H_
+#define FACTOR_QUATERNION_ABSOLUTE_H_
 
 //Wolf includes
 #include "base/factor/factor_autodiff.h"
@@ -23,7 +23,7 @@ class FactorQuaternionAbsolute: public FactorAutodiff<FactorQuaternionAbsolute,3
 {
     public:
 
-        FactorQuaternionAbsolute(StateBlockPtr _sb_ptr, bool _apply_loss_function = false, FactorStatus _status = CTR_ACTIVE) :
+        FactorQuaternionAbsolute(StateBlockPtr _sb_ptr, bool _apply_loss_function = false, FactorStatus _status = FAC_ACTIVE) :
             FactorAutodiff<FactorQuaternionAbsolute,3,4>("QUATERNION ABS",
                     nullptr, nullptr, nullptr, nullptr, nullptr, _apply_loss_function, _status, _sb_ptr)
         {
diff --git a/include/base/factor/factor_relative_2D_analytic.h b/include/base/factor/factor_relative_2D_analytic.h
index 63ead17ad1ac5a8b55205ce81112ef472ef522d3..5c3aec2333bb85999c6892c6ce365e0de3c5ac2e 100644
--- a/include/base/factor/factor_relative_2D_analytic.h
+++ b/include/base/factor/factor_relative_2D_analytic.h
@@ -1,5 +1,5 @@
-#ifndef CONSTRAINT_RELATIVE_2D_ANALYTIC_H_
-#define CONSTRAINT_RELATIVE_2D_ANALYTIC_H_
+#ifndef FACTOR_RELATIVE_2D_ANALYTIC_H_
+#define FACTOR_RELATIVE_2D_ANALYTIC_H_
 
 //Wolf includes
 #include "base/factor/factor_analytic.h"
@@ -15,40 +15,40 @@ class FactorRelative2DAnalytic : public FactorAnalytic
 {
     public:
 
-        /** \brief Constructor of category CTR_FRAME
+        /** \brief Constructor of category FAC_FRAME
          **/
         FactorRelative2DAnalytic(const std::string& _tp,
                                      const FeatureBasePtr& _ftr_ptr,
                                      const FrameBasePtr& _frame_ptr,
                                      const ProcessorBasePtr& _processor_ptr = nullptr,
                                      bool _apply_loss_function = false,
-                                     FactorStatus _status = CTR_ACTIVE) :
+                                     FactorStatus _status = FAC_ACTIVE) :
             FactorAnalytic(_tp, _frame_ptr, nullptr, nullptr, nullptr, _processor_ptr, _apply_loss_function, _status, _frame_ptr->getP(), _frame_ptr->getO(), _ftr_ptr->getFrame()->getP(), _ftr_ptr->getFrame()->getO())
         {
             //
         }
 
-        /** \brief Constructor of category CTR_FEATURE
+        /** \brief Constructor of category FAC_FEATURE
          **/
         FactorRelative2DAnalytic(const std::string& _tp,
                                      const FeatureBasePtr& _ftr_ptr,
                                      const FeatureBasePtr& _ftr_other_ptr,
                                      const ProcessorBasePtr& _processor_ptr = nullptr,
                                      bool _apply_loss_function = false,
-                                     FactorStatus _status = CTR_ACTIVE) :
+                                     FactorStatus _status = FAC_ACTIVE) :
             FactorAnalytic(_tp, nullptr, nullptr, _ftr_other_ptr, nullptr, _processor_ptr, _apply_loss_function, _status, _ftr_ptr->getFrame()->getP(), _ftr_ptr->getFrame()->getO(), _ftr_other_ptr->getFrame()->getP(), _ftr_other_ptr->getFrame()->getO() )
         {
             //
         }
 
-        /** \brief Constructor of category CTR_LANDMARK
+        /** \brief Constructor of category FAC_LANDMARK
          **/
         FactorRelative2DAnalytic(const std::string& _tp,
                                      const FeatureBasePtr& _ftr_ptr,
                                      const LandmarkBasePtr& _landmark_ptr,
                                      const ProcessorBasePtr& _processor_ptr = nullptr,
                                      bool _apply_loss_function = false,
-                                     FactorStatus _status = CTR_ACTIVE) :
+                                     FactorStatus _status = FAC_ACTIVE) :
             FactorAnalytic(_tp, nullptr, nullptr, nullptr, _landmark_ptr, _processor_ptr, _apply_loss_function, _status, _ftr_ptr->getFrame()->getP(), _ftr_ptr->getFrame()->getO(), _landmark_ptr->getP(), _landmark_ptr->getO())
         {
             //
diff --git a/include/base/feature/feature_base.h b/include/base/feature/feature_base.h
index ac42e22030e61094ad2bb0c8e077c2a3abb6743c..df014203d7f5bb530f192347b4f19136c822de0b 100644
--- a/include/base/feature/feature_base.h
+++ b/include/base/feature/feature_base.h
@@ -81,12 +81,12 @@ class FeatureBase : public NodeBase, public std::enable_shared_from_this<Feature
         FactorBasePtr addFactor(FactorBasePtr _co_ptr);
         FactorBasePtrList& getFactorList();
 
-        virtual FactorBasePtr addConstrainedBy(FactorBasePtr _ctr_ptr);
+        virtual FactorBasePtr addConstrainedBy(FactorBasePtr _fac_ptr);
         unsigned int getHits() const;
         FactorBasePtrList& getConstrainedByList();
 
         // all factors
-        void getFactorList(FactorBasePtrList & _ctr_list);
+        void getFactorList(FactorBasePtrList & _fac_list);
 
     private:
         Eigen::MatrixXs computeSqrtUpper(const Eigen::MatrixXs& _M) const;
diff --git a/include/base/frame_base.h b/include/base/frame_base.h
index 90775781f0dde3c8d018e519dce54279d5b28fe3..e6e4c14db28b5e5c897d851773b1f2ff4534ec84 100644
--- a/include/base/frame_base.h
+++ b/include/base/frame_base.h
@@ -135,8 +135,8 @@ class FrameBase : public NodeBase, public std::enable_shared_from_this<FrameBase
         FactorBasePtr getFactorOf(const ProcessorBasePtr _processor_ptr);
         FactorBasePtr getFactorOf(const ProcessorBasePtr _processor_ptr, const std::string& type);
 
-        void getFactorList(FactorBasePtrList& _ctr_list);
-        virtual FactorBasePtr addConstrainedBy(FactorBasePtr _ctr_ptr);
+        void getFactorList(FactorBasePtrList& _fac_list);
+        virtual FactorBasePtr addConstrainedBy(FactorBasePtr _fac_ptr);
         unsigned int getHits() const;
         FactorBasePtrList& getConstrainedByList();
 
diff --git a/include/base/landmark/landmark_base.h b/include/base/landmark/landmark_base.h
index 25bd5b630549a36a0f6867297161c714592bff5e..f12da14aabfd3dd33c03be8f2bc22fd5de6c2ced 100644
--- a/include/base/landmark/landmark_base.h
+++ b/include/base/landmark/landmark_base.h
@@ -86,7 +86,7 @@ class LandmarkBase : public NodeBase, public std::enable_shared_from_this<Landma
         // Navigate wolf tree
         virtual void setProblem(ProblemPtr _problem) final;
 
-        FactorBasePtr addConstrainedBy(FactorBasePtr _ctr_ptr);
+        FactorBasePtr addConstrainedBy(FactorBasePtr _fac_ptr);
         unsigned int getHits() const;
         FactorBasePtrList& getConstrainedByList();
 
diff --git a/include/base/solver/solver_manager.h b/include/base/solver/solver_manager.h
index 47c45714a9381301d3edb0ac3eace52b8447a189..f64b3571970400704e9ea680e291b705362cdebc 100644
--- a/include/base/solver/solver_manager.h
+++ b/include/base/solver/solver_manager.h
@@ -76,9 +76,9 @@ protected:
 
   virtual std::string solveImpl(const ReportVerbosity report_level) = 0;
 
-  virtual void addFactor(const FactorBasePtr& ctr_ptr) = 0;
+  virtual void addFactor(const FactorBasePtr& fac_ptr) = 0;
 
-  virtual void removeFactor(const FactorBasePtr& ctr_ptr) = 0;
+  virtual void removeFactor(const FactorBasePtr& fac_ptr) = 0;
 
   virtual void addStateBlock(const StateBlockPtr& state_ptr) = 0;
 
diff --git a/include/base/solver_suitesparse/qr_solver.h b/include/base/solver_suitesparse/qr_solver.h
index 8e576b317980318f1d57f4bd40a896cfeb2c0627..4486660569244386e17e0a3eb07a67dbc7753bfd 100644
--- a/include/base/solver_suitesparse/qr_solver.h
+++ b/include/base/solver_suitesparse/qr_solver.h
@@ -535,7 +535,7 @@ class SolverQR
 
             switch (_corrPtr->getTypeId())
             {
-                case CTR_GPS_FIX_2D:
+                case FAC_GPS_FIX_2D:
                 {
                     FactorGPS2D* specific_ptr = (FactorGPS2D*)(_corrPtr);
                     return (CostFunctionBasePtr)(new CostFunctionSparse<FactorGPS2D, specific_ptr->residualSize,
@@ -545,7 +545,7 @@ class SolverQR
                             specific_ptr->block9Size>(specific_ptr));
                     break;
                 }
-                case CTR_ODOM_2D:
+                case FAC_ODOM_2D:
                 {
                     FactorOdom2D* specific_ptr = (FactorOdom2D*)(_corrPtr);
                     return (CostFunctionBasePtr)new CostFunctionSparse<FactorOdom2D, specific_ptr->residualSize,
@@ -555,7 +555,7 @@ class SolverQR
                             specific_ptr->block9Size>(specific_ptr);
                     break;
                 }
-                case CTR_CORNER_2D:
+                case FAC_CORNER_2D:
                 {
                     FactorCorner2D* specific_ptr = (FactorCorner2D*)(_corrPtr);
                     return (CostFunctionBasePtr)new CostFunctionSparse<FactorCorner2D, specific_ptr->residualSize,
diff --git a/include/base/trajectory_base.h b/include/base/trajectory_base.h
index ce6dd438f1438642078af1759596c229ac34f74d..9150f8fa0daeb9f7999f38f35a5db02712a63c10 100644
--- a/include/base/trajectory_base.h
+++ b/include/base/trajectory_base.h
@@ -47,7 +47,7 @@ class TrajectoryBase : public NodeBase, public std::enable_shared_from_this<Traj
         FrameBaseIter computeFrameOrder(FrameBasePtr _frame_ptr);
 
         // factors
-        void getFactorList(FactorBasePtrList & _ctr_list);
+        void getFactorList(FactorBasePtrList & _fac_list);
 
 };
 
diff --git a/src/capture/capture_base.cpp b/src/capture/capture_base.cpp
index cf7322fa63b4fcd3d4896a281795f60509cc64a9..86165e4503302e5898a1ae0c6f2129297d2b2b73 100644
--- a/src/capture/capture_base.cpp
+++ b/src/capture/capture_base.cpp
@@ -115,17 +115,17 @@ void CaptureBase::addFeatureList(FeatureBasePtrList& _new_ft_list)
     feature_list_.splice(feature_list_.end(), _new_ft_list);
 }
 
-void CaptureBase::getFactorList(FactorBasePtrList& _ctr_list)
+void CaptureBase::getFactorList(FactorBasePtrList& _fac_list)
 {
     for (auto f_ptr : getFeatureList())
-        f_ptr->getFactorList(_ctr_list);
+        f_ptr->getFactorList(_fac_list);
 }
 
-FactorBasePtr CaptureBase::addConstrainedBy(FactorBasePtr _ctr_ptr)
+FactorBasePtr CaptureBase::addConstrainedBy(FactorBasePtr _fac_ptr)
 {
-    constrained_by_list_.push_back(_ctr_ptr);
-    _ctr_ptr->setCaptureOtherPtr(shared_from_this());
-    return _ctr_ptr;
+    constrained_by_list_.push_back(_fac_ptr);
+    _fac_ptr->setCaptureOtherPtr(shared_from_this());
+    return _fac_ptr;
 }
 
 StateBlockPtr CaptureBase::getStateBlockPtr(unsigned int _i) const
diff --git a/src/examples/test_imuDock.cpp b/src/examples/test_imuDock.cpp
index da4e5beb411e726c9ef10a12d50527a49c27c42f..dff0efd51fe4a71d8d9dc22b6630f4b50fa62946 100644
--- a/src/examples/test_imuDock.cpp
+++ b/src/examples/test_imuDock.cpp
@@ -183,7 +183,7 @@ int main(int argc, char** argv)
     featureFix_cov(5,5) = pow( .01 , 2); // yaw variance
     CaptureBasePtr cap_fix = KF1->addCapture(std::make_shared<CaptureMotion>(0, nullptr, problem_origin.head(7), 7, 6, nullptr));
     FeatureBasePtr featureFix = cap_fix->addFeature(std::make_shared<FeatureBase>("ODOM 3D", problem_origin.head(7), featureFix_cov));
-    FactorFix3DPtr ctr_fix = std::static_pointer_cast<FactorPose3D>(featureFix->addFactor(std::make_shared<FactorPose3D>(featureFix)));
+    FactorFix3DPtr fac_fix = std::static_pointer_cast<FactorPose3D>(featureFix->addFactor(std::make_shared<FactorPose3D>(featureFix)));
 
     Eigen::MatrixXs featureFixBias_cov(6,6);
     featureFixBias_cov = Eigen::MatrixXs::Identity(6,6); 
@@ -192,7 +192,7 @@ int main(int argc, char** argv)
     CaptureBasePtr cap_fixbias = KF1->addCapture(std::make_shared<CaptureMotion>(0, nullptr, problem_origin.tail(6), featureFixBias_cov, 6, 6, nullptr));
     //create a FeatureBase to factor biases
     FeatureBasePtr featureFixBias = cap_fixbias->addFeature(std::make_shared<FeatureBase>("FIX BIAS", problem_origin.tail(6), featureFixBias_cov));
-    FactorFixBiasPtr ctr_fixBias = std::static_pointer_cast<FactorFixBias>(featureFixBias->addFactor(std::make_shared<FactorFixBias>(featureFixBias)));
+    FactorFixBiasPtr fac_fixBias = std::static_pointer_cast<FactorFixBias>(featureFixBias->addFactor(std::make_shared<FactorFixBias>(featureFixBias)));
 
     // ___Fix/Unfix stateblocks___
     KF1->getP()->fix();
diff --git a/src/examples/test_imuDock_autoKFs.cpp b/src/examples/test_imuDock_autoKFs.cpp
index 2cdffa833c26635359665417901a6f70b5746aa4..4415b685cecace3b3aa348d6ca4adfd748219acd 100644
--- a/src/examples/test_imuDock_autoKFs.cpp
+++ b/src/examples/test_imuDock_autoKFs.cpp
@@ -198,7 +198,7 @@ int main(int argc, char** argv)
     featureFix_cov(5,5) = pow( .001 , 2); // yaw variance
     CaptureBasePtr cap_fix = KF1->addCapture(std::make_shared<CaptureMotion>(0, nullptr, problem_origin.head(7), 7, 6, nullptr));
     FeatureBasePtr featureFix = cap_fix->addFeature(std::make_shared<FeatureBase>("ODOM 3D", problem_origin.head(7), featureFix_cov));
-    FactorFix3DPtr ctr_fix = std::static_pointer_cast<FactorPose3D>(featureFix->addFactor(std::make_shared<FactorPose3D>(featureFix)));
+    FactorFix3DPtr fac_fix = std::static_pointer_cast<FactorPose3D>(featureFix->addFactor(std::make_shared<FactorPose3D>(featureFix)));
 
     Eigen::MatrixXs featureFixBias_cov(6,6);
     featureFixBias_cov = Eigen::MatrixXs::Identity(6,6); 
@@ -207,7 +207,7 @@ int main(int argc, char** argv)
     CaptureBasePtr cap_fixbias = KF1->addCapture(std::make_shared<CaptureMotion>(0, nullptr, problem_origin.tail(6), featureFixBias_cov, 6, 6, nullptr));
     //create a FeatureBase to factor biases
     FeatureBasePtr featureFixBias = cap_fixbias->addFeature(std::make_shared<FeatureBase>("FIX BIAS", problem_origin.tail(6), featureFixBias_cov));
-    FactorFixBiasPtr ctr_fixBias = std::static_pointer_cast<FactorFixBias>(featureFixBias->addFactor(std::make_shared<FactorFixBias>(featureFixBias)));
+    FactorFixBiasPtr fac_fixBias = std::static_pointer_cast<FactorFixBias>(featureFixBias->addFactor(std::make_shared<FactorFixBias>(featureFixBias)));
 
     // ___Fix/Unfix stateblocks___
     // fix all Keyframes here
diff --git a/src/examples/test_imu_constrained0.cpp b/src/examples/test_imu_constrained0.cpp
index 7683b18202eb6861ff622e965c81694b08065aa4..f134ccc124603660a1d687fe5fa3357427677415 100644
--- a/src/examples/test_imu_constrained0.cpp
+++ b/src/examples/test_imu_constrained0.cpp
@@ -326,26 +326,26 @@ int main(int argc, char** argv)
     {
         if(frm_ptr->isKey())
         {
-            FactorBasePtrList ctr_list =  frm_ptr->getConstrainedByList();
-            for(FactorBasePtr ctr_ptr : ctr_list)
+            FactorBasePtrList fac_list =  frm_ptr->getConstrainedByList();
+            for(FactorBasePtr fac_ptr : fac_list)
             {
-                if(ctr_ptr->getTypeId() == CTR_IMU)
+                if(fac_ptr->getTypeId() == FAC_IMU)
                 {
-                    //Eigen::VectorXs prev_KF_state(ctr_ptr->getFrameOther()->getState());
-                    //Eigen::VectorXs curr_KF_state(ctr_ptr->getFeature()->getFrame()->getState());
-                    p1      = ctr_ptr->getFrameOther()->getP()->getState();
-                    q1_vec  = ctr_ptr->getFrameOther()->getO()->getState();
-                    v1      = ctr_ptr->getFrameOther()->getV()->getState();
-                    ab1     = std::static_pointer_cast<FrameIMU>(ctr_ptr->getFrameOther())->getAccBias()->getState();
-                    wb1     = std::static_pointer_cast<FrameIMU>(ctr_ptr->getFrameOther())->getGyroBias()->getState();
-
-                    p2      = ctr_ptr->getFeature()->getFrame()->getP()->getState();
-                    q2_vec  = ctr_ptr->getFeature()->getFrame()->getO()->getState();
-                    v2      = ctr_ptr->getFeature()->getFrame()->getV()->getState();
-                    ab2     = std::static_pointer_cast<FrameIMU>(ctr_ptr->getFeature()->getFrame())->getAccBias()->getState();
-                    wb2     = std::static_pointer_cast<FrameIMU>(ctr_ptr->getFeature()->getFrame())->getGyroBias()->getState();
-
-                    std::static_pointer_cast<FactorIMU>(ctr_ptr)->residual(p1, q1, v1, ab1, wb1, p2, q2, v2, ab2, wb2, IMU_residuals);
+                    //Eigen::VectorXs prev_KF_state(fac_ptr->getFrameOther()->getState());
+                    //Eigen::VectorXs curr_KF_state(fac_ptr->getFeature()->getFrame()->getState());
+                    p1      = fac_ptr->getFrameOther()->getP()->getState();
+                    q1_vec  = fac_ptr->getFrameOther()->getO()->getState();
+                    v1      = fac_ptr->getFrameOther()->getV()->getState();
+                    ab1     = std::static_pointer_cast<FrameIMU>(fac_ptr->getFrameOther())->getAccBias()->getState();
+                    wb1     = std::static_pointer_cast<FrameIMU>(fac_ptr->getFrameOther())->getGyroBias()->getState();
+
+                    p2      = fac_ptr->getFeature()->getFrame()->getP()->getState();
+                    q2_vec  = fac_ptr->getFeature()->getFrame()->getO()->getState();
+                    v2      = fac_ptr->getFeature()->getFrame()->getV()->getState();
+                    ab2     = std::static_pointer_cast<FrameIMU>(fac_ptr->getFeature()->getFrame())->getAccBias()->getState();
+                    wb2     = std::static_pointer_cast<FrameIMU>(fac_ptr->getFeature()->getFrame())->getGyroBias()->getState();
+
+                    std::static_pointer_cast<FactorIMU>(fac_ptr)->residual(p1, q1, v1, ab1, wb1, p2, q2, v2, ab2, wb2, IMU_residuals);
                     std::cout << "IMU residuals : " << IMU_residuals.transpose() << std::endl;
                 }
             }
diff --git a/src/examples/test_simple_AHP.cpp b/src/examples/test_simple_AHP.cpp
index 9d21a43c000ab3a7313980d36365e04ed922d7c2..142b9980846a38c123e01a61c4df2513f724729e 100644
--- a/src/examples/test_simple_AHP.cpp
+++ b/src/examples/test_simple_AHP.cpp
@@ -159,23 +159,23 @@ int main(int argc, char** argv)
     std::cout << "Landmark 1: " << lmk_1->point().transpose() << std::endl;
 
     // Factors------------------
-    FactorAHPPtr ctr_0 = FactorAHP::create(feat_0, lmk_1, nullptr);
-    feat_0->addFactor(ctr_0);
-    FactorAHPPtr ctr_1 = FactorAHP::create(feat_1, lmk_1, nullptr);
-    feat_1->addFactor(ctr_1);
-    FactorAHPPtr ctr_2 = FactorAHP::create(feat_2, lmk_1, nullptr);
-    feat_2->addFactor(ctr_2);
+    FactorAHPPtr fac_0 = FactorAHP::create(feat_0, lmk_1, nullptr);
+    feat_0->addFactor(fac_0);
+    FactorAHPPtr fac_1 = FactorAHP::create(feat_1, lmk_1, nullptr);
+    feat_1->addFactor(fac_1);
+    FactorAHPPtr fac_2 = FactorAHP::create(feat_2, lmk_1, nullptr);
+    feat_2->addFactor(fac_2);
 
     // Projections----------------------------
-    Eigen::VectorXs pix_0 = ctr_0->expectation();
+    Eigen::VectorXs pix_0 = fac_0->expectation();
     kp_0 = cv::KeyPoint(pix_0(0), pix_0(1), 0);
     feat_0->setKeypoint(kp_0);
 
-    Eigen::VectorXs pix_1 = ctr_1->expectation();
+    Eigen::VectorXs pix_1 = fac_1->expectation();
     kp_1 = cv::KeyPoint(pix_1(0), pix_1(1), 0);
     feat_1->setKeypoint(kp_1);
 
-    Eigen::VectorXs pix_2 = ctr_2->expectation();
+    Eigen::VectorXs pix_2 = fac_2->expectation();
     kp_2 = cv::KeyPoint(pix_2(0), pix_2(1), 0);
     feat_2->setKeypoint(kp_2);
 
@@ -209,13 +209,13 @@ int main(int argc, char** argv)
     std::cout << "Landmark 2: " << lmk_2->point().transpose() << std::endl;
 
     // New factors from kf3 and kf4
-    FactorAHPPtr ctr_3 = FactorAHP::create(feat_3, lmk_2, nullptr);
-    feat_3->addFactor(ctr_3);
-    FactorAHPPtr ctr_4 = FactorAHP::create(feat_4, lmk_2, nullptr);
-    feat_4->addFactor(ctr_4);
+    FactorAHPPtr fac_3 = FactorAHP::create(feat_3, lmk_2, nullptr);
+    feat_3->addFactor(fac_3);
+    FactorAHPPtr fac_4 = FactorAHP::create(feat_4, lmk_2, nullptr);
+    feat_4->addFactor(fac_4);
 
-    Eigen::Vector2s pix_3 = ctr_3->expectation();
-    Eigen::Vector2s pix_4 = ctr_4->expectation();
+    Eigen::Vector2s pix_3 = fac_3->expectation();
+    Eigen::Vector2s pix_4 = fac_4->expectation();
 
     std::cout << "pix 3: " << pix_3.transpose() << std::endl;
     std::cout << "pix 4: " << pix_4.transpose() << std::endl;
diff --git a/src/examples/test_wolf_imported_graph.cpp b/src/examples/test_wolf_imported_graph.cpp
index 2bfe0055a7187be7905e8f6fa02984eeed977090..1113af8b7f7e9bd40033ed60e182cc2f485eee99 100644
--- a/src/examples/test_wolf_imported_graph.cpp
+++ b/src/examples/test_wolf_imported_graph.cpp
@@ -335,7 +335,7 @@ int main(int argc, char** argv)
 
     for (auto c_it=factors.begin(); c_it!=factors.end(); c_it++)
     {
-        if ((*c_it)->getCategory() != CTR_FRAME) continue;
+        if ((*c_it)->getCategory() != FAC_FRAME) continue;
 
         // ii (old)
         wolf_problem_prun->getCovarianceBlock((*c_it)->getFrameOther()->getP(), (*c_it)->getFrameOther()->getP(), Sigma_ii, 0, 0);
@@ -388,7 +388,7 @@ int main(int argc, char** argv)
         //std::cout << "IG = " << IG << std::endl;
 
         if (IG < 2)
-            (*c_it)->setStatus(CTR_INACTIVE);
+            (*c_it)->setStatus(FAC_INACTIVE);
     }
     double t_ig = ((double) clock() - t1) / CLOCKS_PER_SEC;
     std::cout << "manual sigma computation " << t_sigma_manual << "s" << std::endl;
diff --git a/src/examples/test_wolf_prunning.cpp b/src/examples/test_wolf_prunning.cpp
index c7b7efa863b896949ee926aaf9e5fa29e8f7421c..f3ed29007190ada48bba1758a1ac4e57843ff423 100644
--- a/src/examples/test_wolf_prunning.cpp
+++ b/src/examples/test_wolf_prunning.cpp
@@ -82,7 +82,7 @@ int main(int argc, char** argv)
     Eigen::SparseMatrix<Scalar> Lambda(0,0);
 
     // prunning
-    FactorBasePtrList ordered_ctr_ptr;
+    FactorBasePtrList ordered_fac_ptr;
     std::list<Scalar> ordered_ig;
 
     // Ceres wrapper
@@ -358,7 +358,7 @@ int main(int argc, char** argv)
 
     for (auto c_it=factors.begin(); c_it!=factors.end(); c_it++)
     {
-        if ((*c_it)->getCategory() != CTR_FRAME) continue;
+        if ((*c_it)->getCategory() != FAC_FRAME) continue;
 
         // Measurement covariance
         Sigma_z = (*c_it)->getFeature()->getMeasurementCovariance();
@@ -507,22 +507,22 @@ int main(int argc, char** argv)
         if (IG < 2 && IG > 0 && !std::isnan(IG))
         {
             // Store as a candidate to be prunned, ordered by information gain
-            auto ordered_ctr_it = ordered_ctr_ptr.begin();
-            for (auto ordered_ig_it = ordered_ig.begin(); ordered_ig_it != ordered_ig.end(); ordered_ig_it++, ordered_ctr_it++ )
+            auto ordered_fac_it = ordered_fac_ptr.begin();
+            for (auto ordered_ig_it = ordered_ig.begin(); ordered_ig_it != ordered_ig.end(); ordered_ig_it++, ordered_fac_it++ )
                 if (IG < (*ordered_ig_it))
                 {
                     ordered_ig.insert(ordered_ig_it, IG);
-                    ordered_ctr_ptr.insert(ordered_ctr_it, (*c_it));
+                    ordered_fac_ptr.insert(ordered_fac_it, (*c_it));
                     break;
                 }
             ordered_ig.insert(ordered_ig.end(), IG);
-            ordered_ctr_ptr.insert(ordered_ctr_ptr.end(), (*c_it));
+            ordered_fac_ptr.insert(ordered_fac_ptr.end(), (*c_it));
         }
     }
 
     // PRUNNING
     std::vector<bool> any_inactive_in_frame(wolf_problem_prun->getTrajectory()->getFrameList().size(), false);
-    for (auto c_it = ordered_ctr_ptr.begin(); c_it != ordered_ctr_ptr.end(); c_it++ )
+    for (auto c_it = ordered_fac_ptr.begin(); c_it != ordered_fac_ptr.end(); c_it++ )
     {
         // Check heuristic: factor do not share node with any inactive factor
         unsigned int& index_frame = frame_ptr_2_index_prun[(*c_it)->getCapture()->getFrame()];
@@ -531,7 +531,7 @@ int main(int argc, char** argv)
         if (!any_inactive_in_frame[index_frame] && !any_inactive_in_frame[index_frame_other])
         {
             std::cout << "setting inactive" << (*c_it)->id() << std::endl;
-            (*c_it)->setStatus(CTR_INACTIVE);
+            (*c_it)->setStatus(FAC_INACTIVE);
             std::cout << "set!" << std::endl;
             any_inactive_in_frame[index_frame] = true;
             any_inactive_in_frame[index_frame_other] = true;
diff --git a/src/factor/factor_base.cpp b/src/factor/factor_base.cpp
index ba158d9afac05727deeeb4a332e9ebfc6a496871..e3dc7b1ab767657d613dc99c9f41925cf6a290da 100644
--- a/src/factor/factor_base.cpp
+++ b/src/factor/factor_base.cpp
@@ -123,9 +123,9 @@ void FactorBase::setStatus(FactorStatus _status)
         std::cout << "factor not linked with 'top', only status changed" << std::endl;
     else if (_status != status_)
     {
-        if (_status == CTR_ACTIVE)
+        if (_status == FAC_ACTIVE)
             getProblem()->addFactor(shared_from_this());
-        else if (_status == CTR_INACTIVE)
+        else if (_status == FAC_INACTIVE)
             getProblem()->removeFactor(shared_from_this());
     }
     status_ = _status;
diff --git a/src/feature/feature_base.cpp b/src/feature/feature_base.cpp
index 5836bab02f10a2aa74b0c10f613d557cf4985922..39061dea53cbe3ee5e63f4ca1b542bd12afed644 100644
--- a/src/feature/feature_base.cpp
+++ b/src/feature/feature_base.cpp
@@ -59,7 +59,7 @@ FactorBasePtr FeatureBase::addFactor(FactorBasePtr _co_ptr)
     // add factor to be added in solver
     if (getProblem() != nullptr)
     {
-        if (_co_ptr->getStatus() == CTR_ACTIVE)
+        if (_co_ptr->getStatus() == FAC_ACTIVE)
             getProblem()->addFactor(_co_ptr);
     }
     else
@@ -72,11 +72,11 @@ FrameBasePtr FeatureBase::getFrame() const
     return capture_ptr_.lock()->getFrame();
 }
 
-FactorBasePtr FeatureBase::addConstrainedBy(FactorBasePtr _ctr_ptr)
+FactorBasePtr FeatureBase::addConstrainedBy(FactorBasePtr _fac_ptr)
 {
-    constrained_by_list_.push_back(_ctr_ptr);
-    _ctr_ptr->setFeatureOtherPtr(shared_from_this());
-    return _ctr_ptr;
+    constrained_by_list_.push_back(_fac_ptr);
+    _fac_ptr->setFeatureOtherPtr(shared_from_this());
+    return _fac_ptr;
 }
 
 FactorBasePtrList& FeatureBase::getFactorList()
@@ -84,9 +84,9 @@ FactorBasePtrList& FeatureBase::getFactorList()
     return factor_list_;
 }
 
-void FeatureBase::getFactorList(FactorBasePtrList & _ctr_list)
+void FeatureBase::getFactorList(FactorBasePtrList & _fac_list)
 {
-    _ctr_list.insert(_ctr_list.end(), factor_list_.begin(), factor_list_.end());
+    _fac_list.insert(_fac_list.end(), factor_list_.begin(), factor_list_.end());
 }
 
 void FeatureBase::setMeasurementCovariance(const Eigen::MatrixXs & _meas_cov)
diff --git a/src/frame_base.cpp b/src/frame_base.cpp
index 3e983ef3e9a200b670439d0d739340c18fa20e73..fcf542af51341dbe6e747ae99f383e76a6304c38 100644
--- a/src/frame_base.cpp
+++ b/src/frame_base.cpp
@@ -332,17 +332,17 @@ FactorBasePtr FrameBase::getFactorOf(const ProcessorBasePtr _processor_ptr)
     return nullptr;
 }
 
-void FrameBase::getFactorList(FactorBasePtrList& _ctr_list)
+void FrameBase::getFactorList(FactorBasePtrList& _fac_list)
 {
     for (auto c_ptr : getCaptureList())
-        c_ptr->getFactorList(_ctr_list);
+        c_ptr->getFactorList(_fac_list);
 }
 
-FactorBasePtr FrameBase::addConstrainedBy(FactorBasePtr _ctr_ptr)
+FactorBasePtr FrameBase::addConstrainedBy(FactorBasePtr _fac_ptr)
 {
-    constrained_by_list_.push_back(_ctr_ptr);
-    _ctr_ptr->setFrameOtherPtr(shared_from_this());
-    return _ctr_ptr;
+    constrained_by_list_.push_back(_fac_ptr);
+    _fac_ptr->setFrameOtherPtr(shared_from_this());
+    return _fac_ptr;
 }
 
 FrameBasePtr FrameBase::create_PO_2D(const FrameType & _tp,
diff --git a/src/landmark/landmark_base.cpp b/src/landmark/landmark_base.cpp
index 32bf0b6a7634e5d216325b42f3cb5fe3714e8951..48f66967cbfc59d2fbe237ca5ae8320070c1789e 100644
--- a/src/landmark/landmark_base.cpp
+++ b/src/landmark/landmark_base.cpp
@@ -170,11 +170,11 @@ YAML::Node LandmarkBase::saveToYaml() const
     return node;
 }
 
-FactorBasePtr LandmarkBase::addConstrainedBy(FactorBasePtr _ctr_ptr)
+FactorBasePtr LandmarkBase::addConstrainedBy(FactorBasePtr _fac_ptr)
 {
-    constrained_by_list_.push_back(_ctr_ptr);
-    _ctr_ptr->setLandmarkOtherPtr(shared_from_this());
-    return _ctr_ptr;
+    constrained_by_list_.push_back(_fac_ptr);
+    _fac_ptr->setLandmarkOtherPtr(shared_from_this());
+    return _fac_ptr;
 }
 
 } // namespace wolf
diff --git a/src/landmark/landmark_polyline_2D.cpp b/src/landmark/landmark_polyline_2D.cpp
index 91e790ae704729f91cf2c10797ebfa10c61b5800..b31117566ac69542436e471dd1b1639492680a86 100644
--- a/src/landmark/landmark_polyline_2D.cpp
+++ b/src/landmark/landmark_polyline_2D.cpp
@@ -177,12 +177,12 @@ void LandmarkPolyline2D::defineExtreme(const bool _back)
     	getProblem()->addStateBlock(state);
 
     // remove and add all factors to the point
-    for (auto ctr_ptr : getConstrainedByList())
-        for (auto st_ptr : ctr_ptr->getStateBlockPtrVector())
+    for (auto fac_ptr : getConstrainedByList())
+        for (auto st_ptr : fac_ptr->getStateBlockPtrVector())
             if (st_ptr == state && getProblem() != nullptr)
             {
-                getProblem()->removeFactor(ctr_ptr);
-                getProblem()->addFactor(ctr_ptr);
+                getProblem()->removeFactor(fac_ptr);
+                getProblem()->addFactor(fac_ptr);
             }
 
     // update boolean
@@ -236,68 +236,68 @@ void LandmarkPolyline2D::mergePoints(int _remove_id, int _remain_id)
     // Change factors from remove_state to remain_state
     FactorBasePtrList old_factors_list = getConstrainedByList();
     std::cout << "changing factors: " << old_factors_list.size() << std::endl;
-    FactorBasePtr new_ctr_ptr = nullptr;
-    for (auto ctr_ptr : old_factors_list)
+    FactorBasePtr new_fac_ptr = nullptr;
+    for (auto fac_ptr : old_factors_list)
     {
-        FactorPoint2DPtr ctr_point_ptr;
-        FactorPointToLine2DPtr ctr_point_line_ptr;
-        if ( (ctr_point_ptr = std::dynamic_pointer_cast<FactorPoint2D>(ctr_ptr)))
-//        if (ctr_ptr->getTypeId() == CTR_POINT_2D)
+        FactorPoint2DPtr fac_point_ptr;
+        FactorPointToLine2DPtr fac_point_line_ptr;
+        if ( (fac_point_ptr = std::dynamic_pointer_cast<FactorPoint2D>(fac_ptr)))
+//        if (fac_ptr->getTypeId() == FAC_POINT_2D)
         {
-//            FactorPoint2DPtr ctr_point_ptr = std::static_pointer_cast<FactorPoint2D>(ctr_ptr);
+//            FactorPoint2DPtr fac_point_ptr = std::static_pointer_cast<FactorPoint2D>(fac_ptr);
 
             // If landmark point constrained -> new factor
-            if (ctr_point_ptr->getLandmarkPointId() == _remove_id)
-                new_ctr_ptr = std::make_shared<FactorPoint2D>(std::static_pointer_cast<FeaturePolyline2D>(ctr_ptr->getFeature()),
+            if (fac_point_ptr->getLandmarkPointId() == _remove_id)
+                new_fac_ptr = std::make_shared<FactorPoint2D>(std::static_pointer_cast<FeaturePolyline2D>(fac_ptr->getFeature()),
                                                                   std::static_pointer_cast<LandmarkPolyline2D>(shared_from_this()),
-                                                                  ctr_point_ptr->getProcessor(),
-                                                                  ctr_point_ptr->getFeaturePointId(),
+                                                                  fac_point_ptr->getProcessor(),
+                                                                  fac_point_ptr->getFeaturePointId(),
                                                                   _remain_id,
-                                                                  ctr_point_ptr->getApplyLossFunction(),
-                                                                  ctr_point_ptr->getStatus());
+                                                                  fac_point_ptr->getApplyLossFunction(),
+                                                                  fac_point_ptr->getStatus());
         }
-        else if ((ctr_point_line_ptr = std::dynamic_pointer_cast<FactorPointToLine2D>(ctr_ptr)))
-//        else if  (ctr_ptr->getTypeId() == CTR_POINT_TO_LINE_2D)
+        else if ((fac_point_line_ptr = std::dynamic_pointer_cast<FactorPointToLine2D>(fac_ptr)))
+//        else if  (fac_ptr->getTypeId() == FAC_POINT_TO_LINE_2D)
         {
-//            FactorPointToLine2DPtr ctr_point_line_ptr = std::static_pointer_cast<FactorPointToLine2D>(ctr_ptr);
+//            FactorPointToLine2DPtr fac_point_line_ptr = std::static_pointer_cast<FactorPointToLine2D>(fac_ptr);
 
             // If landmark point constrained -> new factor
-            if (ctr_point_line_ptr->getLandmarkPointId() == _remove_id)
-                new_ctr_ptr = std::make_shared<FactorPointToLine2D>(std::static_pointer_cast<FeaturePolyline2D>(ctr_ptr->getFeature()),
+            if (fac_point_line_ptr->getLandmarkPointId() == _remove_id)
+                new_fac_ptr = std::make_shared<FactorPointToLine2D>(std::static_pointer_cast<FeaturePolyline2D>(fac_ptr->getFeature()),
                                                                         std::static_pointer_cast<LandmarkPolyline2D>(shared_from_this()),
-                                                                        ctr_point_line_ptr->getProcessor(),
-                                                                        ctr_point_line_ptr->getFeaturePointId(),
+                                                                        fac_point_line_ptr->getProcessor(),
+                                                                        fac_point_line_ptr->getFeaturePointId(),
                                                                         _remain_id,
-                                                                        ctr_point_line_ptr->getLandmarkPointAuxId(),
-                                                                        ctr_point_ptr->getApplyLossFunction(),
-                                                                        ctr_point_line_ptr->getStatus());
+                                                                        fac_point_line_ptr->getLandmarkPointAuxId(),
+                                                                        fac_point_ptr->getApplyLossFunction(),
+                                                                        fac_point_line_ptr->getStatus());
             // If landmark point is aux point -> new factor
-            else if (ctr_point_line_ptr->getLandmarkPointAuxId() == _remove_id)
-                new_ctr_ptr = std::make_shared<FactorPointToLine2D>(std::static_pointer_cast<FeaturePolyline2D>(ctr_ptr->getFeature()),
+            else if (fac_point_line_ptr->getLandmarkPointAuxId() == _remove_id)
+                new_fac_ptr = std::make_shared<FactorPointToLine2D>(std::static_pointer_cast<FeaturePolyline2D>(fac_ptr->getFeature()),
                                                                         std::static_pointer_cast<LandmarkPolyline2D>(shared_from_this()),
-                                                                        ctr_point_line_ptr->getProcessor(),
-                                                                        ctr_point_line_ptr->getFeaturePointId(),
-                                                                        ctr_point_line_ptr->getLandmarkPointId(),
+                                                                        fac_point_line_ptr->getProcessor(),
+                                                                        fac_point_line_ptr->getFeaturePointId(),
+                                                                        fac_point_line_ptr->getLandmarkPointId(),
                                                                         _remain_id,
-                                                                        ctr_point_line_ptr->getApplyLossFunction(),
-                                                                        ctr_point_line_ptr->getStatus());
+                                                                        fac_point_line_ptr->getApplyLossFunction(),
+                                                                        fac_point_line_ptr->getStatus());
         }
         else
             throw std::runtime_error ("polyline factor of unknown type");
 
         // If new factor
-        if (new_ctr_ptr != nullptr)
+        if (new_fac_ptr != nullptr)
         {
-            std::cout << "created new factor: " << new_ctr_ptr->id() << std::endl;
-            std::cout << "deleting factor: " << ctr_ptr->id() << std::endl;
+            std::cout << "created new factor: " << new_fac_ptr->id() << std::endl;
+            std::cout << "deleting factor: " << fac_ptr->id() << std::endl;
 
             // add new factor
-            ctr_ptr->getFeature()->addFactor(new_ctr_ptr);
+            fac_ptr->getFeature()->addFactor(new_fac_ptr);
 
             // remove factor
-            ctr_ptr->remove();
+            fac_ptr->remove();
 
-            new_ctr_ptr = nullptr;
+            new_fac_ptr = nullptr;
         }
     }
 
diff --git a/src/processor/processor_IMU.cpp b/src/processor/processor_IMU.cpp
index 3db8717532a42f339ccf5e690e3b95c7017b9136..3f1f5b2445ea42bda8b863beddaf52210bbf4c4c 100644
--- a/src/processor/processor_IMU.cpp
+++ b/src/processor/processor_IMU.cpp
@@ -214,14 +214,14 @@ FactorBasePtr ProcessorIMU::emplaceFactor(FeatureBasePtr _feature_motion, Captur
 {
     CaptureIMUPtr cap_imu = std::static_pointer_cast<CaptureIMU>(_capture_origin);
     FeatureIMUPtr ftr_imu = std::static_pointer_cast<FeatureIMU>(_feature_motion);
-    FactorIMUPtr ctr_imu = std::make_shared<FactorIMU>(ftr_imu, cap_imu, shared_from_this());
+    FactorIMUPtr fac_imu = std::make_shared<FactorIMU>(ftr_imu, cap_imu, shared_from_this());
 
     // link ot wolf tree
-    _feature_motion->addFactor(ctr_imu);
-    _capture_origin->addConstrainedBy(ctr_imu);
-    _capture_origin->getFrame()->addConstrainedBy(ctr_imu);
+    _feature_motion->addFactor(fac_imu);
+    _capture_origin->addConstrainedBy(fac_imu);
+    _capture_origin->getFrame()->addConstrainedBy(fac_imu);
 
-    return ctr_imu;
+    return fac_imu;
 }
 
 void ProcessorIMU::computeCurrentDelta(const Eigen::VectorXs& _data,
diff --git a/src/processor/processor_diff_drive.cpp b/src/processor/processor_diff_drive.cpp
index 07b577b6d187c6116db088d90a5422825246e4f8..4e307962e94a3fc2e205cf7cd1c80f480d2871c4 100644
--- a/src/processor/processor_diff_drive.cpp
+++ b/src/processor/processor_diff_drive.cpp
@@ -212,14 +212,14 @@ CaptureMotionPtr ProcessorDiffDrive::createCapture(const TimeStamp& _ts,
 FactorBasePtr ProcessorDiffDrive::emplaceFactor(FeatureBasePtr _feature,
                                                         CaptureBasePtr _capture_origin)
 {
-  FactorOdom2DPtr ctr_odom =
+  FactorOdom2DPtr fac_odom =
       std::make_shared<FactorOdom2D>(_feature, _capture_origin->getFrame(),
                                          shared_from_this());
 
-  _feature->addFactor(ctr_odom);
-  _capture_origin->getFrame()->addConstrainedBy(ctr_odom);
+  _feature->addFactor(fac_odom);
+  _capture_origin->getFrame()->addConstrainedBy(fac_odom);
 
-  return ctr_odom;
+  return fac_odom;
 }
 
 FeatureBasePtr ProcessorDiffDrive::createFeature(CaptureMotionPtr _capture_motion)
diff --git a/src/processor/processor_frame_nearest_neighbor_filter.cpp b/src/processor/processor_frame_nearest_neighbor_filter.cpp
index 7df561f9c32f24d7cde4d139e9c49f26dea15563..769cf871be36a1969a0e2c4883b044f9cabdbda3 100644
--- a/src/processor/processor_frame_nearest_neighbor_filter.cpp
+++ b/src/processor/processor_frame_nearest_neighbor_filter.cpp
@@ -76,10 +76,10 @@ bool ProcessorFrameNearestNeighborFilter::findCandidates(const CaptureBasePtr& /
     {
       // Check if the two frames currently evaluated are already
       // constrained one-another.
-      const FactorBasePtrList& ctr_list = key_it->getConstrainedByList();
+      const FactorBasePtrList& fac_list = key_it->getConstrainedByList();
 
       bool are_constrained = false;
-      for (const FactorBasePtr& crt : ctr_list)
+      for (const FactorBasePtr& crt : fac_list)
       {
         // Are the two frames constrained one-another ?
         if (crt->getFrameOther() == problem_ptr->getLastKeyFrame())
diff --git a/src/processor/processor_motion.cpp b/src/processor/processor_motion.cpp
index f20aec34d73915b74ea6e695bee164d632d4d905..4798ead84ec1c9ebdf1bea82bd2155bf9d17f454 100644
--- a/src/processor/processor_motion.cpp
+++ b/src/processor/processor_motion.cpp
@@ -135,9 +135,9 @@ void ProcessorMotion::process(CaptureBasePtr _incoming_ptr)
 
                 // Modify existing factor --------
                 // Instead of modifying, we remove one ctr, and create a new one.
-                auto ctr_to_remove  = existing_feature->getFactorList().back(); // there is only one factor!
+                auto fac_to_remove  = existing_feature->getFactorList().back(); // there is only one factor!
                 auto new_ctr        = emplaceFactor(existing_feature, capture_for_keyframe_callback);
-                ctr_to_remove       ->remove();  // remove old factor now (otherwise c->remove() gets propagated to f, C, F, etc.)
+                fac_to_remove       ->remove();  // remove old factor now (otherwise c->remove() gets propagated to f, C, F, etc.)
             }
             break;
         }
@@ -203,7 +203,7 @@ void ProcessorMotion::process(CaptureBasePtr _incoming_ptr)
         auto key_feature_ptr = emplaceFeature(last_ptr_);
 
         // create motion factor and link it to parent feature and other frame (which is origin's frame)
-        auto ctr_ptr = emplaceFactor(key_feature_ptr, origin_ptr_);
+        auto fac_ptr = emplaceFactor(key_feature_ptr, origin_ptr_);
 
         // create a new frame
         auto new_frame_ptr = getProblem()->emplaceFrame(NON_KEY_FRAME,
diff --git a/src/processor/processor_odom_2D.cpp b/src/processor/processor_odom_2D.cpp
index 57119faf60e8f125aec310ac22213210b286963c..a474ed1f3a3bd6d015624d4e3cb5165de005dd16 100644
--- a/src/processor/processor_odom_2D.cpp
+++ b/src/processor/processor_odom_2D.cpp
@@ -154,11 +154,11 @@ CaptureMotionPtr ProcessorOdom2D::createCapture(const TimeStamp& _ts, const Sens
 
 FactorBasePtr ProcessorOdom2D::emplaceFactor(FeatureBasePtr _feature, CaptureBasePtr _capture_origin)
 {
-    FactorOdom2DPtr ctr_odom = std::make_shared<FactorOdom2D>(_feature, _capture_origin->getFrame(),
+    FactorOdom2DPtr fac_odom = std::make_shared<FactorOdom2D>(_feature, _capture_origin->getFrame(),
                                                                       shared_from_this());
-    _feature->addFactor(ctr_odom);
-    _capture_origin->getFrame()->addConstrainedBy(ctr_odom);
-    return ctr_odom;
+    _feature->addFactor(fac_odom);
+    _capture_origin->getFrame()->addConstrainedBy(fac_odom);
+    return fac_odom;
 }
 
 FeatureBasePtr ProcessorOdom2D::createFeature(CaptureMotionPtr _capture_motion)
diff --git a/src/processor/processor_odom_3D.cpp b/src/processor/processor_odom_3D.cpp
index 917ee944a3babb4d1637233464118ab22e60e6dd..7415459711b62482df8a0de5d32bb56a496180d2 100644
--- a/src/processor/processor_odom_3D.cpp
+++ b/src/processor/processor_odom_3D.cpp
@@ -405,11 +405,11 @@ CaptureMotionPtr ProcessorOdom3D::createCapture(const TimeStamp& _ts, const Sens
 
 FactorBasePtr ProcessorOdom3D::emplaceFactor(FeatureBasePtr _feature_motion, CaptureBasePtr _capture_origin)
 {
-    FactorOdom3DPtr ctr_odom = std::make_shared<FactorOdom3D>(_feature_motion, _capture_origin->getFrame(),
+    FactorOdom3DPtr fac_odom = std::make_shared<FactorOdom3D>(_feature_motion, _capture_origin->getFrame(),
                                                                       shared_from_this());
-    _feature_motion->addFactor(ctr_odom);
-    _capture_origin->getFrame()->addConstrainedBy(ctr_odom);
-    return ctr_odom;
+    _feature_motion->addFactor(fac_odom);
+    _capture_origin->getFrame()->addConstrainedBy(fac_odom);
+    return fac_odom;
 }
 
 FeatureBasePtr ProcessorOdom3D::createFeature(CaptureMotionPtr _capture_motion)
diff --git a/src/processor/processor_tracker_feature.cpp b/src/processor/processor_tracker_feature.cpp
index fdeacd6caca540a65ead14e3265daaaa460d3ab3..670f3aaf776d371bc1db000d84184f5643cc8e2e 100644
--- a/src/processor/processor_tracker_feature.cpp
+++ b/src/processor/processor_tracker_feature.cpp
@@ -148,18 +148,18 @@ void ProcessorTrackerFeature::establishFactors()
         FeatureBasePtr feature_in_origin = pair_trkid_pair.second.first;
         FeatureBasePtr feature_in_last   = pair_trkid_pair.second.second;
 
-        auto ctr_ptr  = createFactor(feature_in_last, feature_in_origin);
-        feature_in_last  ->addFactor(ctr_ptr);
-        feature_in_origin->addConstrainedBy(ctr_ptr);
+        auto fac_ptr  = createFactor(feature_in_last, feature_in_origin);
+        feature_in_last  ->addFactor(fac_ptr);
+        feature_in_origin->addConstrainedBy(fac_ptr);
 
-        if (ctr_ptr != nullptr) // factor links
+        if (fac_ptr != nullptr) // factor links
         {
-            FrameBasePtr frm = ctr_ptr->getFrameOther();
+            FrameBasePtr frm = fac_ptr->getFrameOther();
             if (frm)
-                frm->addConstrainedBy(ctr_ptr);
-            CaptureBasePtr cap = ctr_ptr->getCaptureOther();
+                frm->addConstrainedBy(fac_ptr);
+            CaptureBasePtr cap = fac_ptr->getCaptureOther();
             if (cap)
-                cap->addConstrainedBy(ctr_ptr);
+                cap->addConstrainedBy(fac_ptr);
         }
 
 
diff --git a/src/processor/processor_tracker_feature_trifocal.cpp b/src/processor/processor_tracker_feature_trifocal.cpp
index 126a504e965d4d4b32f90c9a7b07eb39e50f4c58..980c652af00ecb490250ac0baabb375ddf5ba98e 100644
--- a/src/processor/processor_tracker_feature_trifocal.cpp
+++ b/src/processor/processor_tracker_feature_trifocal.cpp
@@ -416,7 +416,7 @@ void ProcessorTrackerFeatureTrifocal::establishFactors()
                 FeatureBasePtr ftr_last = pair_trkid_match.second.second;
 
                 // make factor
-                FactorAutodiffTrifocalPtr ctr = std::make_shared<FactorAutodiffTrifocal>(ftr_prev, ftr_orig, ftr_last, shared_from_this(), false, CTR_ACTIVE);
+                FactorAutodiffTrifocalPtr ctr = std::make_shared<FactorAutodiffTrifocal>(ftr_prev, ftr_orig, ftr_last, shared_from_this(), false, FAC_ACTIVE);
 
                 // link to wolf tree
                 ftr_last->addFactor(ctr);
diff --git a/src/processor/processor_tracker_landmark.cpp b/src/processor/processor_tracker_landmark.cpp
index 9c67c53ad4d00c297ce2ca48c01187e7634636d8..3d5b75c8fcc6e9ef70ef396c31a6960a5aa3a016 100644
--- a/src/processor/processor_tracker_landmark.cpp
+++ b/src/processor/processor_tracker_landmark.cpp
@@ -131,18 +131,18 @@ void ProcessorTrackerLandmark::establishFactors()
     for (auto last_feature : last_ptr_->getFeatureList())
     {
         auto lmk = matches_landmark_from_last_[last_feature]->landmark_ptr_;
-        FactorBasePtr ctr_ptr = createFactor(last_feature,
+        FactorBasePtr fac_ptr = createFactor(last_feature,
                                                      lmk);
-        if (ctr_ptr != nullptr) // factor links
+        if (fac_ptr != nullptr) // factor links
         {
-            last_feature->addFactor(ctr_ptr);
-            lmk->addConstrainedBy(ctr_ptr);
-            FrameBasePtr frm = ctr_ptr->getFrameOther();
+            last_feature->addFactor(fac_ptr);
+            lmk->addConstrainedBy(fac_ptr);
+            FrameBasePtr frm = fac_ptr->getFrameOther();
             if (frm)
-                frm->addConstrainedBy(ctr_ptr);
-            CaptureBasePtr cap = ctr_ptr->getCaptureOther();
+                frm->addConstrainedBy(fac_ptr);
+            CaptureBasePtr cap = fac_ptr->getCaptureOther();
             if (cap)
-                cap->addConstrainedBy(ctr_ptr);
+                cap->addConstrainedBy(fac_ptr);
         }
     }
 }
diff --git a/src/solver/solver_manager.cpp b/src/solver/solver_manager.cpp
index 5fe5321742ad13ccba46d777f86bea847ae1a09d..17f6e562bb242ba315369effd722391f52f7cf4c 100644
--- a/src/solver/solver_manager.cpp
+++ b/src/solver/solver_manager.cpp
@@ -14,16 +14,16 @@ SolverManager::SolverManager(const ProblemPtr& _wolf_problem) :
 void SolverManager::update()
 {
     // REMOVE CONSTRAINTS
-    auto ctr_notification_it = wolf_problem_->getFactorNotificationMap().begin();
-    while ( ctr_notification_it != wolf_problem_->getFactorNotificationMap().end() )
+    auto fac_notification_it = wolf_problem_->getFactorNotificationMap().begin();
+    while ( fac_notification_it != wolf_problem_->getFactorNotificationMap().end() )
     {
-        if (ctr_notification_it->second == REMOVE)
+        if (fac_notification_it->second == REMOVE)
         {
-            removeFactor(ctr_notification_it->first);
-            ctr_notification_it = wolf_problem_->getFactorNotificationMap().erase(ctr_notification_it);
+            removeFactor(fac_notification_it->first);
+            fac_notification_it = wolf_problem_->getFactorNotificationMap().erase(fac_notification_it);
         }
         else
-            ctr_notification_it++;
+            fac_notification_it++;
     }
 
     // ADD/REMOVE STATE BLOCS
@@ -67,13 +67,13 @@ void SolverManager::update()
     }
 
     // ADD CONSTRAINTS
-    ctr_notification_it = wolf_problem_->getFactorNotificationMap().begin();
-    while (ctr_notification_it != wolf_problem_->getFactorNotificationMap().end())
+    fac_notification_it = wolf_problem_->getFactorNotificationMap().begin();
+    while (fac_notification_it != wolf_problem_->getFactorNotificationMap().end())
     {
         assert(wolf_problem_->getFactorNotificationMap().begin()->second == ADD && "unexpected factor notification value after all REMOVE have been processed, this should be ADD");
 
         addFactor(wolf_problem_->getFactorNotificationMap().begin()->first);
-        ctr_notification_it = wolf_problem_->getFactorNotificationMap().erase(ctr_notification_it);
+        fac_notification_it = wolf_problem_->getFactorNotificationMap().erase(fac_notification_it);
     }
 
     // UPDATE STATE BLOCKS (state, fix or local parameterization)
diff --git a/src/solver_suitesparse/solver_manager.cpp b/src/solver_suitesparse/solver_manager.cpp
index 7d3081ad7985bf33a5896efe21150381098bceeb..2ba7af7081a64abec0149777e790c6fc355b6c49 100644
--- a/src/solver_suitesparse/solver_manager.cpp
+++ b/src/solver_suitesparse/solver_manager.cpp
@@ -48,12 +48,12 @@ void SolverManager::update(const WolfProblemPtr _problem_ptr)
 		//std::cout << "state units removed!" << std::endl;
 
 		// ADD CONSTRAINTS
-		FactorBasePtrList ctr_list;
-		_problem_ptr->getTrajectory()->getFactorList(ctr_list);
-		//std::cout << "ctr_list.size() = " << ctr_list.size() << std::endl;
-		for(auto ctr_it = ctr_list.begin(); ctr_it!=ctr_list.end(); ctr_it++)
-			if ((*ctr_it)->getPendingStatus() == ADD_PENDING)
-				addFactor(*ctr_it);
+		FactorBasePtrList fac_list;
+		_problem_ptr->getTrajectory()->getFactorList(fac_list);
+		//std::cout << "fac_list.size() = " << fac_list.size() << std::endl;
+		for(auto fac_it = fac_list.begin(); fac_it!=fac_list.end(); fac_it++)
+			if ((*fac_it)->getPendingStatus() == ADD_PENDING)
+				addFactor(*fac_it);
 
 		//std::cout << "factors updated!" << std::endl;
 	}
@@ -152,7 +152,7 @@ ceres::CostFunction* SolverManager::createCostFunction(FactorBasePtr _corrPtr)
 
 	switch (_corrPtr->getFactorType())
 	{
-		case CTR_GPS_FIX_2D:
+		case FAC_GPS_FIX_2D:
 		{
 			FactorGPS2D* specific_ptr = (FactorGPS2D*)(_corrPtr);
 			return new ceres::AutoDiffCostFunction<FactorGPS2D,
@@ -169,7 +169,7 @@ ceres::CostFunction* SolverManager::createCostFunction(FactorBasePtr _corrPtr)
 													specific_ptr->block9Size>(specific_ptr);
 			break;
 		}
-		case CTR_ODOM_2D_COMPLEX_ANGLE:
+		case FAC_ODOM_2D_COMPLEX_ANGLE:
 		{
 			FactorOdom2DComplexAngle* specific_ptr = (FactorOdom2DComplexAngle*)(_corrPtr);
 			return new ceres::AutoDiffCostFunction<FactorOdom2DComplexAngle,
@@ -186,7 +186,7 @@ ceres::CostFunction* SolverManager::createCostFunction(FactorBasePtr _corrPtr)
 													specific_ptr->block9Size>(specific_ptr);
 			break;
 		}
-		case CTR_ODOM_2D:
+		case FAC_ODOM_2D:
 		{
 			FactorOdom2D* specific_ptr = (FactorOdom2D*)(_corrPtr);
 			return new ceres::AutoDiffCostFunction<FactorOdom2D,
@@ -203,7 +203,7 @@ ceres::CostFunction* SolverManager::createCostFunction(FactorBasePtr _corrPtr)
 													specific_ptr->block9Size>(specific_ptr);
 			break;
 		}
-		case CTR_CORNER_2D:
+		case FAC_CORNER_2D:
 		{
 			FactorCorner2D* specific_ptr = (FactorCorner2D*)(_corrPtr);
 			return new ceres::AutoDiffCostFunction<FactorCorner2D,
@@ -220,7 +220,7 @@ ceres::CostFunction* SolverManager::createCostFunction(FactorBasePtr _corrPtr)
 													specific_ptr->block9Size>(specific_ptr);
 			break;
 		}
-		case CTR_IMU:
+		case FAC_IMU:
 		{
 			FactorIMU* specific_ptr = (FactorIMU*)(_corrPtr);
 			return new ceres::AutoDiffCostFunction<FactorIMU,
diff --git a/src/trajectory_base.cpp b/src/trajectory_base.cpp
index 2e96c6a72006f530c9e6a2598e6e8d0245281910..cf01f2d788ed6a28390a460ee526e566412c9bb6 100644
--- a/src/trajectory_base.cpp
+++ b/src/trajectory_base.cpp
@@ -38,10 +38,10 @@ FrameBasePtr TrajectoryBase::addFrame(FrameBasePtr _frame_ptr)
     return _frame_ptr;
 }
 
-void TrajectoryBase::getFactorList(FactorBasePtrList & _ctr_list)
+void TrajectoryBase::getFactorList(FactorBasePtrList & _fac_list)
 {
 	for(auto fr_ptr : getFrameList())
-		fr_ptr->getFactorList(_ctr_list);
+		fr_ptr->getFactorList(_fac_list);
 }
 
 void TrajectoryBase::sortFrame(FrameBasePtr _frame_ptr)
diff --git a/test/gtest_ceres_manager.cpp b/test/gtest_ceres_manager.cpp
index f9a5396077305f82c958bb6c22eb194d568947e4..3f92fc0872e1f1869a998c0acda2fffaad25f3e3 100644
--- a/test/gtest_ceres_manager.cpp
+++ b/test/gtest_ceres_manager.cpp
@@ -60,9 +60,9 @@ class CeresManagerWrapper : public CeresManager
             return ceres_problem_->NumResidualBlocks();
         };
 
-        bool isFactorRegistered(const FactorBasePtr& ctr_ptr) const
+        bool isFactorRegistered(const FactorBasePtr& fac_ptr) const
         {
-            return fac_2_residual_idx_.find(ctr_ptr) != fac_2_residual_idx_.end() && fac_2_costfunction_.find(ctr_ptr) != fac_2_costfunction_.end();
+            return fac_2_residual_idx_.find(fac_ptr) != fac_2_residual_idx_.end() && fac_2_costfunction_.find(fac_ptr) != fac_2_costfunction_.end();
         };
 
         bool hasThisLocalParametrization(const StateBlockPtr& st, const LocalParametrizationBasePtr& local_param)
diff --git a/test/gtest_factor_IMU.cpp b/test/gtest_factor_IMU.cpp
index b7d3143faa0021c805ebed57c1015250970f0aa2..6c8990c291af5bb43dc9e042f9ca60dc84854e75 100644
--- a/test/gtest_factor_IMU.cpp
+++ b/test/gtest_factor_IMU.cpp
@@ -2459,7 +2459,7 @@ TEST_F(FactorIMU_ODOM_biasTest_Move_NonNullBiasRotY, VarQ1B1B2P2Q2_InvarP1V1V2_i
     featureFix_cov(5,5) = 0.1;
     CaptureBasePtr capfix = origin_KF->addCapture(std::make_shared<CaptureMotion>(0, nullptr, (Eigen::Vector7s() << 0,0,0, 0,0,0,1).finished(), 7, 6, nullptr));
     FeatureBasePtr ffix = capfix->addFeature(std::make_shared<FeatureBase>("ODOM 3D", (Eigen::Vector7s() << 0,0,0, 0,0,0,1).finished(), featureFix_cov));
-    FactorFix3DPtr ctr_fix = std::static_pointer_cast<FactorPose3D>(ffix->addFactor(std::make_shared<FactorPose3D>(ffix)));
+    FactorFix3DPtr fac_fix = std::static_pointer_cast<FactorPose3D>(ffix->addFactor(std::make_shared<FactorPose3D>(ffix)));
     
     //prepare problem for solving
     origin_KF->getP()->fix();
@@ -2517,7 +2517,7 @@ TEST_F(FactorIMU_ODOM_biasTest_Move_NonNullBiasRotXY, VarQ1B1B2P2Q2_InvarP1V1V2_
     featureFix_cov(5,5) = 0.1;
     CaptureBasePtr capfix = origin_KF->addCapture(std::make_shared<CaptureMotion>(0, nullptr, (Eigen::Vector7s() << 0,0,0, 0,0,0,1).finished(), 7, 6, nullptr));
     FeatureBasePtr ffix = capfix->addFeature(std::make_shared<FeatureBase>("ODOM 3D", (Eigen::Vector7s() << 0,0,0, 0,0,0,1).finished(), featureFix_cov));
-    FactorFix3DPtr ctr_fix = std::static_pointer_cast<FactorPose3D>(ffix->addFactor(std::make_shared<FactorPose3D>(ffix)));
+    FactorFix3DPtr fac_fix = std::static_pointer_cast<FactorPose3D>(ffix->addFactor(std::make_shared<FactorPose3D>(ffix)));
     
     //prepare problem for solving
     origin_KF->getP()->fix();
diff --git a/test/gtest_factor_absolute.cpp b/test/gtest_factor_absolute.cpp
index 64d71f268636a5c26d9556567f1d77a4d37996f0..204c6ce633a36380d46eacbc65d66abe1a7747fe 100644
--- a/test/gtest_factor_absolute.cpp
+++ b/test/gtest_factor_absolute.cpp
@@ -46,7 +46,7 @@ CaptureBasePtr cap0 = frm0->addCapture(std::make_shared<CaptureMotion>("IMU ABS"
  * Both features and factors are created in the TEST(). Hence, tests will not interfere each others.
  */
 
-TEST(FactorBlockAbs, ctr_block_abs_p)
+TEST(FactorBlockAbs, fac_block_abs_p)
 {
     FeatureBasePtr fea0 = cap0->addFeature(std::make_shared<FeatureBase>("POSITION", pose10.head<3>(), data_cov.topLeftCorner<3,3>()));
     fea0->addFactor(std::make_shared<FactorBlockAbsolute>(fea0->getFrame()->getP()));
@@ -64,7 +64,7 @@ TEST(FactorBlockAbs, ctr_block_abs_p)
     ASSERT_MATRIX_APPROX(frm0->getP()->getState(), pose10.head<3>(), 1e-6);
 }
 
-TEST(FactorBlockAbs, ctr_block_abs_p_tail2)
+TEST(FactorBlockAbs, fac_block_abs_p_tail2)
 {
     FeatureBasePtr fea0 = cap0->addFeature(std::make_shared<FeatureBase>("POSITION TAIL 2", pose10.segment<2>(1), data_cov.bottomRightCorner<2,2>()));
     fea0->addFactor(std::make_shared<FactorBlockAbsolute>(fea0->getFrame()->getP(),1,2));
@@ -80,7 +80,7 @@ TEST(FactorBlockAbs, ctr_block_abs_p_tail2)
     ASSERT_MATRIX_APPROX(frm0->getP()->getState().tail<2>(), pose10.segment<2>(1), 1e-6);
 }
 
-TEST(FactorBlockAbs, ctr_block_abs_v)
+TEST(FactorBlockAbs, fac_block_abs_v)
 {
     FeatureBasePtr fea0 = cap0->addFeature(std::make_shared<FeatureBase>("VELOCITY", pose10.tail<3>(), data_cov.bottomRightCorner<3,3>()));
     fea0->addFactor(std::make_shared<FactorBlockAbsolute>(fea0->getFrame()->getV()));
@@ -98,7 +98,7 @@ TEST(FactorBlockAbs, ctr_block_abs_v)
     ASSERT_MATRIX_APPROX(frm0->getV()->getState(), pose10.tail<3>(), 1e-6);
 }
 
-TEST(FactorQuatAbs, ctr_block_abs_o)
+TEST(FactorQuatAbs, fac_block_abs_o)
 {
     FeatureBasePtr fea0 = cap0->addFeature(std::make_shared<FeatureBase>("QUATERNION", pose10.segment<4>(3), data_cov.block<3,3>(3,3)));
     fea0->addFactor(std::make_shared<FactorQuaternionAbsolute>(fea0->getFrame()->getO()));
diff --git a/test/gtest_factor_autodiff.cpp b/test/gtest_factor_autodiff.cpp
index 0372227134c81002f8ee9625bdb78245493bdde9..a053b3f82438b8ac9c358fc45b4b656dd9df65ff 100644
--- a/test/gtest_factor_autodiff.cpp
+++ b/test/gtest_factor_autodiff.cpp
@@ -203,12 +203,12 @@ TEST(CaptureAutodiff, AutodiffVsAnalytic)
     capture_ptr->addFeature(feature_ptr);
 
     // CONSTRAINTS
-    FactorOdom2DPtr ctr_autodiff_ptr = std::make_shared<FactorOdom2D>(feature_ptr, fr1_ptr);
-    feature_ptr->addFactor(ctr_autodiff_ptr);
-    fr1_ptr->addConstrainedBy(ctr_autodiff_ptr);
-    FactorOdom2DAnalyticPtr ctr_analytic_ptr = std::make_shared<FactorOdom2DAnalytic>(feature_ptr, fr1_ptr);
-    feature_ptr->addFactor(ctr_analytic_ptr);
-    fr1_ptr->addConstrainedBy(ctr_analytic_ptr);
+    FactorOdom2DPtr fac_autodiff_ptr = std::make_shared<FactorOdom2D>(feature_ptr, fr1_ptr);
+    feature_ptr->addFactor(fac_autodiff_ptr);
+    fr1_ptr->addConstrainedBy(fac_autodiff_ptr);
+    FactorOdom2DAnalyticPtr fac_analytic_ptr = std::make_shared<FactorOdom2DAnalytic>(feature_ptr, fr1_ptr);
+    feature_ptr->addFactor(fac_analytic_ptr);
+    fr1_ptr->addConstrainedBy(fac_analytic_ptr);
 
     // COMPUTE JACOBIANS
 
@@ -220,13 +220,13 @@ TEST(CaptureAutodiff, AutodiffVsAnalytic)
     std::vector<const Scalar*> states_ptr({fr1_pstate.data(), fr1_ostate.data(), fr2_pstate.data(), fr2_ostate.data()});
 
     std::vector<Eigen::MatrixXs> Jautodiff, Janalytic;
-    Eigen::VectorXs residuals(ctr_autodiff_ptr->getSize());
+    Eigen::VectorXs residuals(fac_autodiff_ptr->getSize());
     clock_t t = clock();
-    ctr_autodiff_ptr->evaluate(states_ptr, residuals, Jautodiff);
+    fac_autodiff_ptr->evaluate(states_ptr, residuals, Jautodiff);
     std::cout << "autodiff evaluate: " << ((double) clock() - t) / CLOCKS_PER_SEC << "s" << std::endl;
     t = clock();
     //TODO FactorAnalytic::evaluate
-//    ctr_analytic_ptr->evaluate(states_ptr, residuals, Janalytic);
+//    fac_analytic_ptr->evaluate(states_ptr, residuals, Janalytic);
 //    std::cout << "analytic evaluate: " << ((double) clock() - t) / CLOCKS_PER_SEC << "s" << std::endl;
 //
 //    for (auto i = 0; i < Jautodiff.size(); i++)
diff --git a/test/gtest_factor_autodiff_distance_3D.cpp b/test/gtest_factor_autodiff_distance_3D.cpp
index 1de85bd61f08403640b02359243cb32eb239840a..7559bfa7582aa1449232391806e498fb294d03be 100644
--- a/test/gtest_factor_autodiff_distance_3D.cpp
+++ b/test/gtest_factor_autodiff_distance_3D.cpp
@@ -62,7 +62,7 @@ class FactorAutodiffDistance3D_Test : public testing::Test
             F2->addCapture(C2);
             f2 = std::make_shared<FeatureBase>("Dist", dist, dist_cov);
             C2->addFeature(f2);
-            c2 = std::make_shared<FactorAutodiffDistance3D>(f2, F1, nullptr, false, CTR_ACTIVE);
+            c2 = std::make_shared<FactorAutodiffDistance3D>(f2, F1, nullptr, false, FAC_ACTIVE);
             f2->addFactor(c2);
             F1->addConstrainedBy(c2);
 
diff --git a/test/gtest_factor_autodiff_trifocal.cpp b/test/gtest_factor_autodiff_trifocal.cpp
index 1f872726f70f7fe1ad32330ba6fda8dd4116a8e2..71401381fe35c768d047b8324e0b2e2f74df35c4 100644
--- a/test/gtest_factor_autodiff_trifocal.cpp
+++ b/test/gtest_factor_autodiff_trifocal.cpp
@@ -152,7 +152,7 @@ class FactorAutodiffTrifocalTest : public testing::Test{
             I3-> addFeature(f3);
 
             // trifocal factor
-            c123 = std::make_shared<FactorAutodiffTrifocal>(f1, f2, f3, proc_trifocal, false, CTR_ACTIVE);
+            c123 = std::make_shared<FactorAutodiffTrifocal>(f1, f2, f3, proc_trifocal, false, FAC_ACTIVE);
             f3   ->addFactor   (c123);
             f1   ->addConstrainedBy(c123);
             f2   ->addConstrainedBy(c123);
@@ -710,7 +710,7 @@ class FactorAutodiffTrifocalMultiPointTest : public FactorAutodiffTrifocalTest
                 fv3.push_back(std::make_shared<FeatureBase>("PIXEL", c3p_can.col(i), pix_cov));
                 I3->addFeature(fv3.at(i));
 
-                cv123.push_back(std::make_shared<FactorAutodiffTrifocal>(fv1.at(i), fv2.at(i), fv3.at(i), proc_trifocal, false, CTR_ACTIVE));
+                cv123.push_back(std::make_shared<FactorAutodiffTrifocal>(fv1.at(i), fv2.at(i), fv3.at(i), proc_trifocal, false, FAC_ACTIVE));
                 fv3.at(i)->addFactor(cv123.at(i));
                 fv1.at(i)->addConstrainedBy(cv123.at(i));
                 fv2.at(i)->addConstrainedBy(cv123.at(i));
@@ -888,17 +888,17 @@ TEST_F(FactorAutodiffTrifocalMultiPointTest, solve_multi_point_distance)
     F3->addCapture(Cd);
     FeatureBasePtr fd = std::make_shared<FeatureBase>("DISTANCE", Vector1s(distance), Matrix1s(distance_std * distance_std));
     Cd->addFeature(fd);
-    FactorAutodiffDistance3DPtr cd = std::make_shared<FactorAutodiffDistance3D>(fd, F1, nullptr, false, CTR_ACTIVE);
+    FactorAutodiffDistance3DPtr cd = std::make_shared<FactorAutodiffDistance3D>(fd, F1, nullptr, false, FAC_ACTIVE);
     fd->addFactor(cd);
     F1->addConstrainedBy(cd);
 
-    cd->setStatus(CTR_INACTIVE);
+    cd->setStatus(FAC_INACTIVE);
     std::string report = ceres_manager->solve(SolverManager::ReportVerbosity::BRIEF);
     WOLF_DEBUG("DISTANCE CONSTRAINT INACTIVE: \n", report);
 
     problem->print(1,0,1,0);
 
-    cd->setStatus(CTR_ACTIVE);
+    cd->setStatus(FAC_ACTIVE);
     report = ceres_manager->solve(SolverManager::ReportVerbosity::BRIEF);
 
     // Print results
diff --git a/test/gtest_factor_sparse.cpp b/test/gtest_factor_sparse.cpp
index ae419726f9306956f85f41041af1c345757339f2..6c8f212be2030c5d04707eb5b5798848f36d8710 100644
--- a/test/gtest_factor_sparse.cpp
+++ b/test/gtest_factor_sparse.cpp
@@ -31,17 +31,17 @@ class FactorSparseObject : public FactorSparse<1, 2, 1>
 
 TEST(FactorSparseAnalytic, Constructor)
 {
-    FactorSparseObject<JAC_ANALYTIC> ctr_analytic(CTR_AHP, false, CTR_ACTIVE, std::make_shared<StateBlock>(2), std::make_shared<StateBlock>(1));
-    ASSERT_EQ(ctr_analytic.getJacobianMethod(),     JAC_ANALYTIC);
-    ASSERT_EQ(ctr_analytic.getApplyLossFunction(),  false);
-    ASSERT_EQ(ctr_analytic.getStatus(),             CTR_ACTIVE);
-    ASSERT_EQ(ctr_analytic.getSize(),               1);
+    FactorSparseObject<JAC_ANALYTIC> fac_analytic(FAC_AHP, false, FAC_ACTIVE, std::make_shared<StateBlock>(2), std::make_shared<StateBlock>(1));
+    ASSERT_EQ(fac_analytic.getJacobianMethod(),     JAC_ANALYTIC);
+    ASSERT_EQ(fac_analytic.getApplyLossFunction(),  false);
+    ASSERT_EQ(fac_analytic.getStatus(),             FAC_ACTIVE);
+    ASSERT_EQ(fac_analytic.getSize(),               1);
 
-    FactorSparseObject<JAC_AUTO> ctr_auto(CTR_AHP, false, CTR_ACTIVE, std::make_shared<StateBlock>(2), std::make_shared<StateBlock>(1));
-    ASSERT_EQ(ctr_auto.getJacobianMethod(), JAC_AUTO);
+    FactorSparseObject<JAC_AUTO> fac_auto(FAC_AHP, false, FAC_ACTIVE, std::make_shared<StateBlock>(2), std::make_shared<StateBlock>(1));
+    ASSERT_EQ(fac_auto.getJacobianMethod(), JAC_AUTO);
 
-    FactorSparseObject<JAC_NUMERIC> ctr_numeric(CTR_AHP, false, CTR_ACTIVE, std::make_shared<StateBlock>(2), std::make_shared<StateBlock>(1));
-    ASSERT_EQ(ctr_numeric.getJacobianMethod(), JAC_NUMERIC);
+    FactorSparseObject<JAC_NUMERIC> fac_numeric(FAC_AHP, false, FAC_ACTIVE, std::make_shared<StateBlock>(2), std::make_shared<StateBlock>(1));
+    ASSERT_EQ(fac_numeric.getJacobianMethod(), JAC_NUMERIC);
 }
 
 int main(int argc, char **argv)
diff --git a/test/gtest_solver_manager.cpp b/test/gtest_solver_manager.cpp
index 75d29551550172734abc9107ae837efcc2a5c4d6..b6b5f2b85717df13c864551845bdf6c1725c0b39 100644
--- a/test/gtest_solver_manager.cpp
+++ b/test/gtest_solver_manager.cpp
@@ -45,9 +45,9 @@ class SolverManagerWrapper : public SolverManager
             return state_block_fixed_.at(st);
         };
 
-        bool isFactorRegistered(const FactorBasePtr& ctr_ptr) const
+        bool isFactorRegistered(const FactorBasePtr& fac_ptr) const
         {
-            return std::find(factors_.begin(), factors_.end(), ctr_ptr) != factors_.end();
+            return std::find(factors_.begin(), factors_.end(), fac_ptr) != factors_.end();
         };
 
         bool hasThisLocalParametrization(const StateBlockPtr& st, const LocalParametrizationBasePtr& local_param) const
@@ -74,13 +74,13 @@ class SolverManagerWrapper : public SolverManager
     protected:
 
         virtual std::string solveImpl(const ReportVerbosity report_level){ return std::string("");};
-        virtual void addFactor(const FactorBasePtr& ctr_ptr)
+        virtual void addFactor(const FactorBasePtr& fac_ptr)
         {
-            factors_.push_back(ctr_ptr);
+            factors_.push_back(fac_ptr);
         };
-        virtual void removeFactor(const FactorBasePtr& ctr_ptr)
+        virtual void removeFactor(const FactorBasePtr& fac_ptr)
         {
-            factors_.remove(ctr_ptr);
+            factors_.remove(fac_ptr);
         };
         virtual void addStateBlock(const StateBlockPtr& state_ptr)
         {