diff --git a/gtsam/geometry/triangulation.h b/gtsam/geometry/triangulation.h
index c3ab56200..bec901830 100644
--- a/gtsam/geometry/triangulation.h
+++ b/gtsam/geometry/triangulation.h
@@ -376,6 +376,15 @@ class TriangulationResult: public boost::optional<Point3> {
       status_(s) {
   }
 public:
+
+  /**
+   * Default constructor, only for serialization
+   */
+  TriangulationResult() {}
+
+  /**
+   * Constructor
+   */
   TriangulationResult(const Point3& p) :
       status_(VALID) {
     reset(p);
diff --git a/gtsam/slam/SmartFactorBase.h b/gtsam/slam/SmartFactorBase.h
index e903d9651..01a8fcf8d 100644
--- a/gtsam/slam/SmartFactorBase.h
+++ b/gtsam/slam/SmartFactorBase.h
@@ -93,6 +93,9 @@ public:
   /// We use the new CameraSte data structure to refer to a set of cameras
   typedef CameraSet<CAMERA> Cameras;
 
+  /// Default Constructor, for serialization
+  SmartFactorBase() {}
+
   /// Constructor
   SmartFactorBase(const SharedNoiseModel& sharedNoiseModel,
       boost::optional<Pose3> body_P_sensor = boost::none) :
diff --git a/gtsam/slam/SmartProjectionFactor.h b/gtsam/slam/SmartProjectionFactor.h
index 13a4dd38f..09fe84caa 100644
--- a/gtsam/slam/SmartProjectionFactor.h
+++ b/gtsam/slam/SmartProjectionFactor.h
@@ -137,7 +137,7 @@ protected:
 
   /// @name Parameters
   /// @{
-  const SmartProjectionParams params_;
+  SmartProjectionParams params_;
   /// @}
 
   /// @name Caching triangulation
@@ -154,6 +154,11 @@ public:
   /// shorthand for a set of cameras
   typedef CameraSet<CAMERA> Cameras;
 
+  /**
+   * Default constructor, only for serialization
+   */
+  SmartProjectionFactor() {}
+
   /**
    * Constructor
    * @param body_P_sensor pose of the camera in the body frame
diff --git a/gtsam/slam/SmartProjectionPoseFactor.h b/gtsam/slam/SmartProjectionPoseFactor.h
index c091ff79d..455e0de87 100644
--- a/gtsam/slam/SmartProjectionPoseFactor.h
+++ b/gtsam/slam/SmartProjectionPoseFactor.h
@@ -59,6 +59,11 @@ public:
   /// shorthand for a smart pointer to a factor
   typedef boost::shared_ptr<This> shared_ptr;
 
+  /**
+   * Default constructor, only for serialization
+   */
+  SmartProjectionPoseFactor() {}
+
   /**
    * Constructor
    * @param Isotropic measurement noise
diff --git a/gtsam/slam/tests/testSmartFactorBase.cpp b/gtsam/slam/tests/testSmartFactorBase.cpp
index bf5969d4d..96052bd0f 100644
--- a/gtsam/slam/tests/testSmartFactorBase.cpp
+++ b/gtsam/slam/tests/testSmartFactorBase.cpp
@@ -18,6 +18,7 @@
 
 #include <gtsam/slam/SmartFactorBase.h>
 #include <gtsam/geometry/Pose3.h>
+#include <gtsam/base/serializationTestHelpers.h>
 #include <CppUnitLite/TestHarness.h>
 
 using namespace std;
@@ -29,9 +30,13 @@ static SharedNoiseModel unit3(noiseModel::Unit::Create(3));
 /* ************************************************************************* */
 #include <gtsam/geometry/PinholeCamera.h>
 #include <gtsam/geometry/Cal3Bundler.h>
+
+namespace gtsam {
+
 class PinholeFactor: public SmartFactorBase<PinholeCamera<Cal3Bundler> > {
 public:
   typedef SmartFactorBase<PinholeCamera<Cal3Bundler> > Base;
+  PinholeFactor() {}
   PinholeFactor(const SharedNoiseModel& sharedNoiseModel): Base(sharedNoiseModel) {
   }
   virtual double error(const Values& values) const {
@@ -43,6 +48,11 @@ public:
   }
 };
 
+/// traits
+template<>
+struct traits<PinholeFactor> : public Testable<PinholeFactor> {};
+}
+
 TEST(SmartFactorBase, Pinhole) {
   PinholeFactor f= PinholeFactor(unit2);
   f.add(Point2(), 1);
@@ -52,9 +62,13 @@ TEST(SmartFactorBase, Pinhole) {
 
 /* ************************************************************************* */
 #include <gtsam/geometry/StereoCamera.h>
+
+namespace gtsam {
+
 class StereoFactor: public SmartFactorBase<StereoCamera> {
 public:
   typedef SmartFactorBase<StereoCamera> Base;
+  StereoFactor() {}
   StereoFactor(const SharedNoiseModel& sharedNoiseModel): Base(sharedNoiseModel) {
   }
   virtual double error(const Values& values) const {
@@ -66,6 +80,11 @@ public:
   }
 };
 
+/// traits
+template<>
+struct traits<StereoFactor> : public Testable<StereoFactor> {};
+}
+
 TEST(SmartFactorBase, Stereo) {
   StereoFactor f(unit3);
   f.add(StereoPoint2(), 1);
@@ -73,6 +92,24 @@ TEST(SmartFactorBase, Stereo) {
   EXPECT_LONGS_EQUAL(2 * 3, f.dim());
 }
 
+/* ************************************************************************* */
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Constrained, "gtsam_noiseModel_Constrained");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Diagonal, "gtsam_noiseModel_Diagonal");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Gaussian, "gtsam_noiseModel_Gaussian");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Unit, "gtsam_noiseModel_Unit");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Isotropic, "gtsam_noiseModel_Isotropic");
+BOOST_CLASS_EXPORT_GUID(gtsam::SharedNoiseModel, "gtsam_SharedNoiseModel");
+BOOST_CLASS_EXPORT_GUID(gtsam::SharedDiagonal, "gtsam_SharedDiagonal");
+
+TEST(SmartFactorBase, serialize) {
+  using namespace gtsam::serializationTestHelpers;
+  PinholeFactor factor(unit2);
+
+  EXPECT(equalsObj(factor));
+  EXPECT(equalsXML(factor));
+  EXPECT(equalsBinary(factor));
+}
+
 /* ************************************************************************* */
 int main() {
   TestResult tr;
diff --git a/gtsam/slam/tests/testSmartProjectionCameraFactor.cpp b/gtsam/slam/tests/testSmartProjectionCameraFactor.cpp
index d4f60b085..54bbd6c22 100644
--- a/gtsam/slam/tests/testSmartProjectionCameraFactor.cpp
+++ b/gtsam/slam/tests/testSmartProjectionCameraFactor.cpp
@@ -22,6 +22,7 @@
 #include "smartFactorScenarios.h"
 #include <gtsam/slam/SmartProjectionFactor.h>
 #include <gtsam/nonlinear/LevenbergMarquardtOptimizer.h>
+#include <gtsam/base/serializationTestHelpers.h>
 #include <CppUnitLite/TestHarness.h>
 #include <boost/assign/std/map.hpp>
 #include <iostream>
@@ -843,6 +844,26 @@ TEST( SmartProjectionCameraFactor, implicitJacobianFactor ) {
   EXPECT(assert_equal(yActual, yExpected, 1e-7));
 }
 
+
+/* ************************************************************************* */
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Constrained, "gtsam_noiseModel_Constrained");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Diagonal, "gtsam_noiseModel_Diagonal");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Gaussian, "gtsam_noiseModel_Gaussian");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Unit, "gtsam_noiseModel_Unit");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Isotropic, "gtsam_noiseModel_Isotropic");
+BOOST_CLASS_EXPORT_GUID(gtsam::SharedNoiseModel, "gtsam_SharedNoiseModel");
+BOOST_CLASS_EXPORT_GUID(gtsam::SharedDiagonal, "gtsam_SharedDiagonal");
+
+TEST( SmartProjectionCameraFactor, serialize) {
+  using namespace vanilla;
+  using namespace gtsam::serializationTestHelpers;
+  SmartFactor factor(unit2);
+
+  EXPECT(equalsObj(factor));
+  EXPECT(equalsXML(factor));
+  EXPECT(equalsBinary(factor));
+}
+
 /* ************************************************************************* */
 int main() {
   TestResult tr;
diff --git a/gtsam/slam/tests/testSmartProjectionPoseFactor.cpp b/gtsam/slam/tests/testSmartProjectionPoseFactor.cpp
index 8796dfe65..0e2429840 100644
--- a/gtsam/slam/tests/testSmartProjectionPoseFactor.cpp
+++ b/gtsam/slam/tests/testSmartProjectionPoseFactor.cpp
@@ -24,6 +24,7 @@
 #include <gtsam/slam/PoseTranslationPrior.h>
 #include <gtsam/nonlinear/LevenbergMarquardtOptimizer.h>
 #include <gtsam/base/numericalDerivative.h>
+#include <gtsam/base/serializationTestHelpers.h>
 #include <CppUnitLite/TestHarness.h>
 #include <boost/assign/std/map.hpp>
 #include <iostream>
@@ -1387,6 +1388,27 @@ TEST( SmartProjectionPoseFactor, Cal3BundlerRotationOnly ) {
           values.at<Pose3>(x3)));
 }
 
+/* ************************************************************************* */
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Constrained, "gtsam_noiseModel_Constrained");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Diagonal, "gtsam_noiseModel_Diagonal");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Gaussian, "gtsam_noiseModel_Gaussian");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Unit, "gtsam_noiseModel_Unit");
+BOOST_CLASS_EXPORT_GUID(gtsam::noiseModel::Isotropic, "gtsam_noiseModel_Isotropic");
+BOOST_CLASS_EXPORT_GUID(gtsam::SharedNoiseModel, "gtsam_SharedNoiseModel");
+BOOST_CLASS_EXPORT_GUID(gtsam::SharedDiagonal, "gtsam_SharedDiagonal");
+
+TEST(SmartProjectionPoseFactor, serialize) {
+  using namespace vanillaPose;
+  using namespace gtsam::serializationTestHelpers;
+  SmartProjectionParams params;
+  params.setRankTolerance(rankTol);
+  SmartFactor factor(model, sharedK, boost::none, params);
+
+  EXPECT(equalsObj(factor));
+  EXPECT(equalsXML(factor));
+  EXPECT(equalsBinary(factor));
+}
+
 /* ************************************************************************* */
 int main() {
   TestResult tr;