diff --git a/eo/src/eoConstrictedVelocity.h b/eo/src/eoConstrictedVelocity.h
index baac496b..ba3eb4f6 100644
--- a/eo/src/eoConstrictedVelocity.h
+++ b/eo/src/eoConstrictedVelocity.h
@@ -19,6 +19,7 @@
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
     Contact: thomas.legrand@lifl.fr
+             clive.canape@inria.fr
  */
 //-----------------------------------------------------------------------------
 
@@ -170,7 +171,13 @@ public:
         topology.updateNeighborhood(_po,_indice);
     }
 
+	//! eoTopology<POT> getTopology
+    //! @return topology
 
+	eoTopology<POT> & getTopology ()
+	{
+		return topology;
+	}
 
 protected:
     eoTopology < POT > & topology;
diff --git a/eo/src/eoLinearTopology.h b/eo/src/eoLinearTopology.h
index 164d2bf4..f6daed53 100644
--- a/eo/src/eoLinearTopology.h
+++ b/eo/src/eoLinearTopology.h
@@ -19,6 +19,7 @@
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
     Contact: thomas.legrand@lifl.fr
+             clive.canape@inria.fr
  */
 //-----------------------------------------------------------------------------
 
@@ -161,6 +162,28 @@ public:
         return (neighborhoods[theGoodNhbd].best());
     }
 
+	/*
+	 * Return the global best of the topology
+	 */
+	 
+	 virtual POT & globalBest(const eoPop<POT>& _pop)
+    {
+    	unsigned howManyNeighborhood=_pop.size()/ neighborhoodSize;
+    	POT globalBest,tmp;
+    	unsigned indGlobalBest=0;
+    	globalBest=neighborhoods[0].best();
+    	for(unsigned i=1;i<howManyNeighborhood;i++)
+    	{
+    		tmp=neighborhoods[i].best();
+    		if(globalBest.best() < tmp.best())
+    		{
+    			globalBest=tmp;
+    			indGlobalBest=i;
+    		}
+    			
+    	}
+    	return neighborhoods[indGlobalBest].best();
+    }
 
     /**
      * Print the structure of the topology on the standrad output.
diff --git a/eo/src/eoStandardVelocity.h b/eo/src/eoStandardVelocity.h
index 493925a5..314aacd9 100644
--- a/eo/src/eoStandardVelocity.h
+++ b/eo/src/eoStandardVelocity.h
@@ -19,6 +19,7 @@
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
     Contact: thomas.legrand@lifl.fr
+             clive.canape@inria.fr
  */
 //-----------------------------------------------------------------------------
 
@@ -154,7 +155,14 @@ public:
     {
         topology.updateNeighborhood(_po,_indice);
     }
+    
+    //! eoTopology<POT> getTopology
+    //! @return topology
 
+	eoTopology<POT> & getTopology ()
+	{
+		return topology;
+	}
 
 protected:
     eoTopology < POT > & topology;
diff --git a/eo/src/eoStarTopology.h b/eo/src/eoStarTopology.h
index 55fe81b0..5f935cc3 100644
--- a/eo/src/eoStarTopology.h
+++ b/eo/src/eoStarTopology.h
@@ -19,6 +19,7 @@
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
     Contact: thomas.legrand@lifl.fr
+             clive.canape@inria.fr
  */
 //-----------------------------------------------------------------------------
 
@@ -106,6 +107,15 @@ public:
      * @return POT & - The best particle in the neighborhood of the particle whose indice is _indice
      */
     POT & best (unsigned  _indice) {return (neighborhood.best());}
+    
+    /*
+	 * Return the global best of the topology
+	 */
+	 
+	 virtual POT & globalBest(const eoPop<POT>& _pop)
+    {
+    	return neighborhood.best();
+    }
 
 
    /**
diff --git a/eo/src/eoTopology.h b/eo/src/eoTopology.h
index 6a47721e..d62e6a2a 100644
--- a/eo/src/eoTopology.h
+++ b/eo/src/eoTopology.h
@@ -19,6 +19,7 @@
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
     Contact: thomas.legrand@lifl.fr
+             clive.canape@inria.fr
  */
 //-----------------------------------------------------------------------------
 
@@ -63,6 +64,28 @@ public:
      * Build the neighborhoods contained in the topology.
      */
     virtual POT & best (unsigned ) = 0;
+    
+    /*
+     * Return the global best
+     */
+    
+    virtual POT & globalBest(const eoPop<POT>& _pop)
+    {
+    	POT globalBest,tmp;
+    	unsigned indGlobalBest=0;
+    	globalBest=best(0);
+    	for(unsigned i=1;i<_pop.size();i++)
+    	{
+    		tmp=best(i);
+    		if(globalBest.best() < tmp.best())
+    		{
+    			globalBest=tmp;
+    			indGlobalBest=i;
+    		}
+    			
+    	}
+    	return best(indGlobalBest);
+    }
 
     /**
      * Build the neighborhoods contained in the topology.
diff --git a/eo/src/eoVelocity.h b/eo/src/eoVelocity.h
index 7b656dea..3e01efdb 100644
--- a/eo/src/eoVelocity.h
+++ b/eo/src/eoVelocity.h
@@ -29,6 +29,7 @@
 #include <eoFunctor.h>
 #include <utils/eoRNG.h>
 #include <eoPop.h>
+#include <eoTopology.h>
 //-----------------------------------------------------------------------------
 
 /**
@@ -38,7 +39,6 @@
 template < class POT > class eoVelocity:public eoBF < POT &,unsigned , void >
 {
 public:
-
     /**
      * Apply the velocity computation to a whole given population.
      * Used for synchronous PSO.
@@ -69,6 +69,10 @@ public:
         }
 
     }
+    
+   
+   virtual eoTopology<POT> & getTopology () = 0;
+
 };
 
 #endif /*EOVELOCITY_H_H */