diff --git a/branches/paradiseo-moeo-1.0/src/moeoComparator.h b/branches/paradiseo-moeo-1.0/src/moeoComparator.h
index 064c0f78a..259dae142 100644
--- a/branches/paradiseo-moeo-1.0/src/moeoComparator.h
+++ b/branches/paradiseo-moeo-1.0/src/moeoComparator.h
@@ -30,17 +30,27 @@ template < class MOEOT >
 class moeoObjectiveComparator : public moeoComparator < MOEOT >
 {
 public:
+
     /**
-     * Returns true if _moeo1 is greater than _moeo2 on the first objective, then on the second, and so on
+     * Returns true if _moeo1 < _moeo2 on the first objective, then on the second, and so on
      * @param _moeo1 the first solution
      * @param _moeo2 the second solution
      */
     const bool operator()(const MOEOT & _moeo1, const MOEOT & _moeo2)
     {
-        return _moeo1.objectiveVector() > _moeo2.objectiveVector();
+        return cmp(_moeo1.objectiveVector(), _moeo2.objectiveVector());
     }
+
+private:
+
+    /** the objective vector type of the solutions */
+    typedef typename MOEOT::ObjectiveVector ObjectiveVector;
+    /** the corresponding comparator for objective vectors */
+    moeoObjectiveObjectiveVectorComparator < ObjectiveVector > cmp;
+
 };
 
+
 /**
  * Functor allowing to compare two solutions according to one objective.
  */
@@ -62,17 +72,17 @@ public:
     }
 
     /**
-     * Returns true if _moeo1 is greater than _moeo2 on the obj objective
+     * Returns true if _moeo1 < _moeo2 on the obj objective
      * @param _moeo1 the first solution
      * @param _moeo2 the second solution
      */
     const bool operator()(const MOEOT & _moeo1, const MOEOT & _moeo2)
     {
-        return _moeo1.objectiveVector()[obj] > _moeo2.objectiveVector()[obj];
+        return _moeo1.objectiveVector()[obj] < _moeo2.objectiveVector()[obj];
     }
 
 private:
-	/** the index of objective */
+    /** the index of objective */
     unsigned obj;
 
 };
@@ -85,8 +95,9 @@ template < class MOEOT >
 class moeoFitnessThenDiversityComparator : public moeoComparator < MOEOT >
 {
 public:
+
     /**
-     * Returns true if _moeo1 is greater than _moeo2 according to their fitness values, then according to their diversity values	
+     * Returns true if _moeo1 < _moeo2 according to their fitness values, then according to their diversity values	
      * @param _moeo1 the first solution
      * @param _moeo2 the second solution
      */
@@ -94,13 +105,14 @@ public:
     {
         if (_moeo1.fitness() == _moeo2.fitness())
         {
-            return _moeo1.diversity() > _moeo2.diversity();
+            return _moeo1.diversity() < _moeo2.diversity();
         }
         else
         {
-            return _moeo1.fitness() > _moeo2.fitness();
+            return _moeo1.fitness() < _moeo2.fitness();
         }
     }
+
 };
 
 
@@ -111,8 +123,9 @@ template < class MOEOT >
 class moeoDiversityThenFitnessComparator : public moeoComparator < MOEOT >
 {
 public:
+
     /**
-     * Returns true if _moeo1 is greater than _moeo2 according to their diversity values, then according to their fitness values
+     * Returns true if _moeo1 < _moeo2 according to their diversity values, then according to their fitness values
      * @param _moeo1 the first solution
      * @param _moeo2 the second solution
      */
@@ -120,13 +133,14 @@ public:
     {
         if (_moeo1.diversity() == _moeo2.diversity())
         {
-            return _moeo1.fitness() > _moeo2.fitness();
+            return _moeo1.fitness() < _moeo2.fitness();
         }
         else
         {
-            return _moeo1.diversity() > _moeo2.diversity();
+            return _moeo1.diversity() < _moeo2.diversity();
         }
     }
+
 };