diff --git a/trunk/paradiseo-peo/src/core/communicable.cpp b/trunk/paradiseo-peo/src/core/communicable.cpp
index 36f04eaa0..39909dccd 100644
--- a/trunk/paradiseo-peo/src/core/communicable.cpp
+++ b/trunk/paradiseo-peo/src/core/communicable.cpp
@@ -57,7 +57,6 @@ void Communicable :: unlock () {
 }
 
 void Communicable :: stop () {
-
   sem_wait (& sem_stop);
 }
 
diff --git a/trunk/paradiseo-peo/src/core/eoVector_comm.h b/trunk/paradiseo-peo/src/core/eoVector_comm.h
index 27cb3fbee..e8585e422 100644
--- a/trunk/paradiseo-peo/src/core/eoVector_comm.h
+++ b/trunk/paradiseo-peo/src/core/eoVector_comm.h
@@ -1,5 +1,4 @@
 // "eoVector_comm.h"
-
 // (c) OPAC Team, LIFL, August 2005
 
 /* 
@@ -35,4 +34,36 @@ template <class F, class T> void unpack (eoVector <F, T> & __v) {
     unpack (__v [i]);
 }
 
+template <class F, class T, class V> void pack (const eoVectorParticle <F, T, V> & __v) {
+
+  pack (__v.fitness ()) ;
+  pack (__v.best());
+  unsigned len = __v.size ();
+  pack (len);
+  for (unsigned i = 0 ; i < len; i ++)
+    pack (__v [i]);  
+  for (unsigned i = 0 ; i < len; i ++)
+    pack (__v.bestPositions[i]); 
+  for (unsigned i = 0 ; i < len; i ++)
+    pack (__v.velocities[i]);  
+}
+
+template <class F, class T, class V> void unpack (eoVectorParticle <F, T, V> & __v) {
+
+  F fit;
+  unpack(fit);
+  __v.fitness (fit);
+  unpack(fit);
+  __v.best(fit);
+  unsigned len;
+  unpack (len);
+  __v.resize (len);
+  for (unsigned i = 0 ; i < len; i ++)
+    unpack (__v [i]);  
+  for (unsigned i = 0 ; i < len; i ++)
+    unpack (__v.bestPositions[i]); 
+  for (unsigned i = 0 ; i < len; i ++)
+    unpack (__v.velocities[i]);  
+}
+
 #endif
diff --git a/trunk/paradiseo-peo/src/core/messaging.h b/trunk/paradiseo-peo/src/core/messaging.h
index 573375020..c61eb4a6c 100644
--- a/trunk/paradiseo-peo/src/core/messaging.h
+++ b/trunk/paradiseo-peo/src/core/messaging.h
@@ -54,9 +54,10 @@ template <class U, class V> void pack (const std :: pair <U, V> & __pair) {
   pack (__pair.second);
 }
 
+
 //
 
-/* Float */
+/* Char */
 extern void unpack (char & __c); 
 
 /* Float */
@@ -101,4 +102,5 @@ template <class U, class V> void unpack (std :: pair <U, V> & __pair) {
   unpack (__pair.second);
 }
 
+
 #endif
diff --git a/trunk/paradiseo-peo/src/peoEA.h b/trunk/paradiseo-peo/src/peoEA.h
index 516b70af9..ad4d3710d 100644
--- a/trunk/paradiseo-peo/src/peoEA.h
+++ b/trunk/paradiseo-peo/src/peoEA.h
@@ -131,6 +131,7 @@ template< class EOT > void peoEA< EOT > :: run() {
 		trans( off );
 
 		printDebugMessage( "performing the evaluation of the population." );
+
 		pop_eval( off );
 
 		printDebugMessage( "performing the replacement of the population." );
diff --git a/trunk/paradiseo-peo/src/peoEvalFuncPSO.h b/trunk/paradiseo-peo/src/peoEvalFuncPSO.h
new file mode 100644
index 000000000..d08515bd2
--- /dev/null
+++ b/trunk/paradiseo-peo/src/peoEvalFuncPSO.h
@@ -0,0 +1,34 @@
+// "peoPSO.h"
+
+// (c) OPAC Team, October 2007
+
+/* 
+   Contact: clive.canape@inria.fr
+*/
+
+#ifndef PEOEVALFUNCPSO_H
+#define PEOEVALFUNCPSO_H
+
+#include <eoEvalFunc.h>
+
+#ifdef _MSC_VER
+template< class POT, class FitT = POT::Fitness, class FunctionArg = const POT& >
+#else
+template< class POT, class FitT = typename POT::Fitness, class FunctionArg = const POT& >
+#endif
+struct peoEvalFuncPSO: public eoEvalFunc<POT> {
+
+  peoEvalFuncPSO( FitT (* _eval)( FunctionArg ) )
+    : eoEvalFunc<POT>(), evalFunc( _eval ) {};
+  
+  virtual void operator() ( POT & _peo ) 
+  {
+      _peo.fitness((*evalFunc)( _peo ));
+  };
+    
+  private:
+    FitT (* evalFunc )( FunctionArg );
+};
+
+#endif
+
diff --git a/trunk/paradiseo-peo/src/peoPSO.h b/trunk/paradiseo-peo/src/peoPSO.h
new file mode 100644
index 000000000..73b7b4a9f
--- /dev/null
+++ b/trunk/paradiseo-peo/src/peoPSO.h
@@ -0,0 +1,82 @@
+// "peoPSO.h"
+
+// (c) OPAC Team, October 2007
+
+/* 
+   Contact: clive.canape@inria.fr
+*/
+
+#ifndef __peoPSO_h
+#define __peoPSO_h
+
+#include <eoContinue.h> 
+#include <eoEvalFunc.h> 
+#include <eoPopEvalFunc.h>
+#include <eoPSO.h>
+#include <eoVelocity.h>
+#include <eoFlight.h>
+#include "peoPopEval.h"
+#include "core/runner.h" 
+#include "core/peo_debug.h" 
+
+
+template < class POT > class peoPSO : public Runner {
+
+public:
+
+  peoPSO(
+	 eoContinue< POT >& __cont,
+	 peoPopEval< POT >& __pop_eval,
+	 eoVelocity < POT > &_velocity,
+	 eoFlight < POT > &_flight);
+
+
+	void run();
+	
+
+	void operator()( eoPop< POT >& __pop );
+
+private:
+
+	eoContinue< POT >& cont;
+	peoPopEval< POT >& pop_eval;
+	eoPop< POT >* pop;
+	eoVelocity < POT > &velocity;
+	eoFlight < POT > &flight;
+};
+
+
+template < class POT > peoPSO< POT > :: peoPSO( 
+
+				eoContinue< POT >& __cont, 
+				peoPopEval< POT >& __pop_eval, 
+				eoVelocity < POT > &__velocity,
+				eoFlight < POT > &__flight
+				) : cont( __cont ), pop_eval(__pop_eval ),velocity( __velocity),flight( __flight)
+{
+	pop_eval.setOwner( *this );
+}
+
+
+template< class POT > void peoPSO< POT > :: operator ()( eoPop< POT >& __pop ) {
+
+	pop = &__pop;
+}
+
+
+template< class POT > void peoPSO< POT > :: run() {
+
+	printDebugMessage( "Performing the first evaluation of the population." );
+	do {	
+     	        printDebugMessage( "Performing the velocity evaluation." );
+		velocity.apply ( *pop );
+		printDebugMessage( "Performing the flight." );
+		flight.apply ( *pop );
+		printDebugMessage( "Performing the evaluation." );
+		pop_eval(*pop);
+		velocity.updateNeighborhood( *pop );
+	} while ( cont( *pop ) );
+}
+
+
+#endif
diff --git a/trunk/paradiseo-peo/src/peoParaPopEval.h b/trunk/paradiseo-peo/src/peoParaPopEval.h
index 8e9760d89..4f9697802 100644
--- a/trunk/paradiseo-peo/src/peoParaPopEval.h
+++ b/trunk/paradiseo-peo/src/peoParaPopEval.h
@@ -120,20 +120,15 @@ template< class EOT > peoParaPopEval< EOT > :: peoParaPopEval(
 
 
 template< class EOT > void peoParaPopEval< EOT >::operator()( eoPop< EOT >& __pop ) {
-
-	for ( unsigned i = 0; i < __pop.size(); i++ ) {
-
-		__pop[ i ].fitness( typename EOT :: Fitness() );
-
+  for ( unsigned i = 0; i < __pop.size(); i++ ) {
+    __pop[ i ].fitness(typename EOT :: Fitness() );  	
 		progression[ &__pop[ i ] ].first = funcs.size() - 1;
 		progression[ &__pop[ i ] ].second = funcs.size();
-		
 		for ( unsigned j = 0; j < funcs.size(); j++ ) {
 			/* Queuing the 'invalid' solution and its associated owner */
 			tasks.push( &__pop[ i ] );
 		}
 	}
-	
 	total = funcs.size() * __pop.size();
 	requestResourceRequest( funcs.size() * __pop.size() );
 	stop();
@@ -141,7 +136,6 @@ template< class EOT > void peoParaPopEval< EOT >::operator()( eoPop< EOT >& __po
 
 
 template< class EOT > void peoParaPopEval< EOT > :: packData() {
-
 	//  printDebugMessage ("debut pakc data");
 	pack( progression[ tasks.front() ].first-- );
 	
@@ -155,7 +149,6 @@ template< class EOT > void peoParaPopEval< EOT > :: packData() {
 
 
 template< class EOT > void peoParaPopEval< EOT > :: unpackData() {
-
 	unpack( num_func );
 	/* Unpacking the solution */
 	unpack( sol );
@@ -165,15 +158,13 @@ template< class EOT > void peoParaPopEval< EOT > :: unpackData() {
 
 
 template< class EOT > void peoParaPopEval< EOT > :: execute() {
-
 	/* Computing the fitness of the solution */
-	funcs[ num_func ]->operator()( sol );
+  funcs[ num_func ]->operator()( sol );
 }
 
 
 template< class EOT > void peoParaPopEval< EOT > :: packResult() {
-
-	/* Packing the fitness of the solution */
+  /* Packing the fitness of the solution */
 	pack( sol.fitness() );
 	/* Packing the @ of the individual */
 	pack( ad_sol );
@@ -181,7 +172,6 @@ template< class EOT > void peoParaPopEval< EOT > :: packResult() {
 
 
 template< class EOT > void peoParaPopEval< EOT > :: unpackResult() {
-
 	typename EOT :: Fitness fit;
 	
 	/* Unpacking the computed fitness */
@@ -212,12 +202,10 @@ template< class EOT > void peoParaPopEval< EOT > :: unpackResult() {
 
 
 template< class EOT > void peoParaPopEval< EOT > :: notifySendingData() {
-
 }
 
 
 template< class EOT > void peoParaPopEval< EOT > :: notifySendingAllResourceRequests() {
-
 	getOwner()->setPassive();
 }
 
diff --git a/trunk/paradiseo-peo/tutorial/Lesson2/main.cpp b/trunk/paradiseo-peo/tutorial/Lesson2/main.cpp
index c6a384006..b30b647e0 100644
--- a/trunk/paradiseo-peo/tutorial/Lesson2/main.cpp
+++ b/trunk/paradiseo-peo/tutorial/Lesson2/main.cpp
@@ -22,8 +22,8 @@
 #include <peo>
 
 
-#define POP_SIZE 10
-#define NUM_GEN 100
+#define POP_SIZE 2
+#define NUM_GEN 2
 #define CROSS_RATE 1.0
 #define MUT_RATE 0.01
 
@@ -33,7 +33,7 @@
 // by default, parallel evaluation of the population is performed;
 // for parallel fitness evaluation, uncomment the following line
 
-// #define PARALLEL_FIT_EVALUATION
+#define PARALLEL_FIT_EVALUATION
 
 
 int main( int __argc, char** __argv ) {
@@ -105,6 +105,7 @@ int main( int __argc, char** __argv ) {
 
 	peo :: run( );
 	peo :: finalize( );
+
 	// shutting down the ParadisEO-PEO environment
 
 	return 0;
diff --git a/trunk/paradiseo-peo/tutorial/examples/tsp/route_eval.cpp b/trunk/paradiseo-peo/tutorial/examples/tsp/route_eval.cpp
index 0fed8d481..f654ed4d3 100644
--- a/trunk/paradiseo-peo/tutorial/examples/tsp/route_eval.cpp
+++ b/trunk/paradiseo-peo/tutorial/examples/tsp/route_eval.cpp
@@ -9,6 +9,6 @@
 #include "route_eval.h"
 
 void RouteEval :: operator () (Route & __route) {
-    
+  std::cout<<"\nICI";
   __route.fitness (- (int) length (__route)); 
 }