diff --git a/.cproject b/.cproject
index da141d84a..ceda6fadc 100644
--- a/.cproject
+++ b/.cproject
@@ -793,6 +793,14 @@
 				<useDefaultCommand>true</useDefaultCommand>
 				<runAllBuilders>true</runAllBuilders>
 			</target>
+			<target name="check" path="build/gtsam/discrete" targetID="org.eclipse.cdt.build.MakeTargetBuilder">
+				<buildCommand>make</buildCommand>
+				<buildArguments>-j5</buildArguments>
+				<buildTarget>check</buildTarget>
+				<stopOnError>true</stopOnError>
+				<useDefaultCommand>true</useDefaultCommand>
+				<runAllBuilders>true</runAllBuilders>
+			</target>
 			<target name="vSFMexample.run" path="build/examples/vSLAMexample" targetID="org.eclipse.cdt.build.MakeTargetBuilder">
 				<buildCommand>make</buildCommand>
 				<buildArguments>-j2</buildArguments>
diff --git a/gtsam/discrete/DecisionTreeFactor.h b/gtsam/discrete/DecisionTreeFactor.h
index a61f12cf5..e98c7020b 100644
--- a/gtsam/discrete/DecisionTreeFactor.h
+++ b/gtsam/discrete/DecisionTreeFactor.h
@@ -33,9 +33,6 @@ namespace gtsam {
 		typedef DiscreteConditional ConditionalType;
 		typedef boost::shared_ptr<DecisionTreeFactor> shared_ptr;
 
-		/// Index label and cardinality
-		typedef std::pair<Index,size_t> IndexC;
-
 	public:
 
 		/// @name Standard Constructors
diff --git a/gtsam/discrete/DiscreteKey.cpp b/gtsam/discrete/DiscreteKey.cpp
index 9ab4207bb..01b025d80 100644
--- a/gtsam/discrete/DiscreteKey.cpp
+++ b/gtsam/discrete/DiscreteKey.cpp
@@ -14,19 +14,6 @@ namespace gtsam {
 
 	using namespace std;
 
-	bool OldDiscreteKey::equals(const OldDiscreteKey& other, double tol) const {
-		return (*this == other);
-	}
-
-	void OldDiscreteKey::print(const string& s) const {
-		cout << s << *this;
-	}
-
-	ostream& operator <<(ostream &os, const OldDiscreteKey &key) {
-		os << key.name_;
-		return os;
-	}
-
 	DiscreteKeys::DiscreteKeys(const vector<int>& cs) {
 		for (size_t i = 0; i < cs.size(); i++) {
 			string name = boost::str(boost::format("v%1%") % i);
diff --git a/gtsam/discrete/DiscreteKey.h b/gtsam/discrete/DiscreteKey.h
index 7c2fca817..87e6e96a6 100644
--- a/gtsam/discrete/DiscreteKey.h
+++ b/gtsam/discrete/DiscreteKey.h
@@ -8,7 +8,6 @@
 #pragma once
 
 #include <gtsam/base/types.h>
-#include <gtsam/discrete/label_traits.h>
 
 #include <map>
 #include <string>
@@ -16,65 +15,11 @@
 
 namespace gtsam {
 
-	typedef std::pair<Index,size_t> DiscreteKey;
-
 	/**
 	 * Key type for discrete conditionals
 	 * Includes name and cardinality
 	 */
-	class OldDiscreteKey : std::pair<Index,size_t> {
-
-	private:
-
-		std::string name_;
-
-	public:
-
-		/** Default constructor */
-		OldDiscreteKey() :
-			std::pair<Index,size_t>(0,0), name_("default") {
-		}
-
-		/** Constructor, defaults to binary */
-		OldDiscreteKey(Index j, const std::string& name, size_t cardinality = 2) :
-			std::pair<Index,size_t>(j,cardinality), name_(name) {
-		}
-
-		virtual ~OldDiscreteKey() {
-		}
-
-		// Testable
-		bool equals(const OldDiscreteKey& other, double tol = 1e-9) const;
-		void print(const std::string& s = "") const;
-
-		operator Index() const { return first; }
-
-		const std::string& name() const {
-			return name_;
-		}
-
-		size_t cardinality() const {
-			return second;
-		}
-
-		/** compare 2 keys by their name */
-		bool operator <(const OldDiscreteKey& other) const {
-			return name_ < other.name_;
-		}
-
-		/** equality */
-		bool operator==(const OldDiscreteKey& other) const {
-			return (first == other.first) && (second == other.second) && (name_ == other.name_);
-		}
-
-		bool operator!=(const OldDiscreteKey& other) const {
-			return !(*this == other);
-		}
-
-		/** provide streaming */
-		friend std::ostream& operator <<(std::ostream &os, const OldDiscreteKey &key);
-
-	}; // OldDiscreteKey
+	typedef std::pair<Index,size_t> DiscreteKey;
 
 	/// DiscreteKeys is a set of keys that can be assembled using the & operator
 	struct DiscreteKeys: public std::vector<DiscreteKey> {
@@ -111,23 +56,4 @@ namespace gtsam {
 
 	/// Create a list from two keys
 	DiscreteKeys operator&(const DiscreteKey& key1, const DiscreteKey& key2);
-
-	/// traits class for DiscreteKey for use with DecisionTree/DecisionDiagram
-	template<>
-	struct label_traits<OldDiscreteKey> {
-		/** get cardinality from type */
-		static size_t cardinality(const OldDiscreteKey& key) {
-			return key.cardinality();
-		}
-		/** compare 2 keys by their name */
-		static bool higher(const OldDiscreteKey& a, const OldDiscreteKey& b) {
-			return a.name() < b.name();
-		}
-		/** hash function */
-		static size_t hash_value(const OldDiscreteKey& a) {
-      boost::hash<std::string> hasher;
-      return hasher(a.name());
-		}
-	};
-
 }
diff --git a/gtsam/discrete/label_traits.h b/gtsam/discrete/label_traits.h
deleted file mode 100644
index 0a0c39094..000000000
--- a/gtsam/discrete/label_traits.h
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * label_traits.h
- * @brief traits class for labels used in Decision Diagram
- * @author Frank Dellaert
- * @date Mar 22, 2011
- */
-
-#pragma once
-
-#include <stdexcept>
-#include <boost/functional/hash.hpp>
-
-namespace gtsam {
-
-	/**
-	 * Default traits class for label type, http://www.cantrip.org/traits.html
-	 * Override to provide non-default behavior, see example in Index
-	 */
-	template<typename T>
-	struct label_traits {
-		/** default = binary label */
-		static size_t cardinality(const T&) {
-			return 2;
-		}
-		/** default higher(a,b) = a<b */
-		static bool higher(const T& a, const T& b) {
-			return a < b;
-		}
-		/** hash function */
-		static size_t hash_value(const T& a) {
-			boost::hash<T> hasher;
-			return hasher(a);
-		}
-	};
-
-	/* custom hash function for labels, no need to specialize this */
-	template<typename T>
-	std::size_t hash_value(const T& a) {
-		return label_traits<T>::hash_value(a);
-	}
-}