diff --git a/eo/src/mpi/eoMpi.h b/eo/src/mpi/eoMpi.h
index 940f41292..7dafe1289 100644
--- a/eo/src/mpi/eoMpi.h
+++ b/eo/src/mpi/eoMpi.h
@@ -25,6 +25,7 @@ namespace eo
         namespace Channel
         {
             const int Commands = 0;
+            const int Messages = 1;
         }
 
         namespace Message
@@ -33,26 +34,32 @@ namespace eo
             const int Finish = 1;
         }
 
+
         template< typename JobData, typename Wrapped >
         struct SharedDataFunction
         {
-            SharedDataFunction( Wrapped * w )
+            SharedDataFunction( Wrapped * w = 0 ) : _wrapped( w )
             {
-                wrapped = w;
+                // empty
+            }
+
+            void wrapped( Wrapped * w )
+            {
+                _wrapped = w;
             }
 
             void data( JobData* _d )
             {
                 d = _d;
-                if( wrapped )
+                if( _wrapped )
                 {
-                    wrapped->data( _d );
+                    _wrapped->data( _d );
                 }
             }
 
             protected:
             JobData* d;
-            Wrapped* wrapped;
+            Wrapped* _wrapped;
         };
 
         template< typename JobData >
@@ -110,11 +117,78 @@ namespace eo
         template< typename JobData >
         struct JobStore
         {
-            virtual SendTaskFunction<JobData> & sendTask() const = 0;
-            virtual HandleResponseFunction<JobData> & handleResponse() const = 0;
-            virtual ProcessTaskFunction<JobData> & processTask() const = 0;
-            virtual IsFinishedFunction<JobData> & isFinished() const = 0;
+            JobStore(
+                SendTaskFunction<JobData>* stf,
+                HandleResponseFunction<JobData>* hrf,
+                ProcessTaskFunction<JobData>* ptf,
+                IsFinishedFunction<JobData>* iff
+            ) :
+                _stf( stf ), _hrf( hrf ), _ptf( ptf ), _iff( iff )
+            {
+                // empty
+            }
+
+            JobStore()
+            {
+                // empty
+            }
+
+            SendTaskFunction<JobData> & sendTask() { return *_stf; }
+            HandleResponseFunction<JobData> & handleResponse() { return *_hrf; }
+            ProcessTaskFunction<JobData> & processTask() { return *_ptf; }
+            IsFinishedFunction<JobData> & isFinished() { return *_iff; }
+
+            void sendTask( SendTaskFunction<JobData>* stf ) { _stf = stf; }
+            void handleResponse( HandleResponseFunction<JobData>* hrf ) { _hrf = hrf; }
+            void processTask( ProcessTaskFunction<JobData>* ptf ) { _ptf = ptf; }
+            void isFinished( IsFinishedFunction<JobData>* iff ) { _iff = iff; }
+
+            void wrapSendTask( SendTaskFunction<JobData>* stf )
+            {
+                if( stf )
+                {
+                    stf->wrapped( _stf );
+                    _stf = stf;
+                }
+            }
+
+            void wrapHandleResponse( HandleResponseFunction<JobData>* hrf )
+            {
+                if( hrf )
+                {
+                    hrf->wrapped( _hrf );
+                    _hrf = hrf;
+                }
+            }
+
+            void wrapProcessTask( ProcessTaskFunction<JobData>* ptf )
+            {
+                if( ptf )
+                {
+                    ptf->wrapped( _ptf );
+                    _ptf = ptf;
+                }
+            }
+
+            void wrapIsFinished( IsFinishedFunction<JobData>* iff )
+            {
+                if( iff )
+                {
+                    iff->wrapped( _iff );
+                    _iff = iff;
+                }
+            }
+
+            // TODO commenter : laissé à la couche d'en dessous car impossible d'initialiser une donnée membre d'une classe mère depuis une classe fille.
             virtual JobData* data() = 0;
+
+            protected:
+
+            // TODO commenter : Utiliser des pointeurs pour éviter d'écraser les fonctions wrappées
+            SendTaskFunction< JobData >* _stf;
+            HandleResponseFunction< JobData >* _hrf;
+            ProcessTaskFunction< JobData >* _ptf;
+            IsFinishedFunction< JobData >* _iff;
         };
 
         template< class JobData >
@@ -141,15 +215,6 @@ namespace eo
                     isFinished.data( store.data() );
                 }
 
-                /*
-                // master
-                virtual bool isFinished() = 0;
-                virtual void sendTask( int wrkRank ) = 0;
-                virtual void handleResponse( int wrkRank ) = 0;
-                // worker
-                virtual void processTask( ) = 0;
-                */
-
             protected:
 
                 SendTaskFunction<JobData> & sendTask;
diff --git a/eo/src/mpi/eoParallelApply.h b/eo/src/mpi/eoParallelApply.h
index 94549fc31..1487da9fb 100644
--- a/eo/src/mpi/eoParallelApply.h
+++ b/eo/src/mpi/eoParallelApply.h
@@ -153,6 +153,11 @@ namespace eo
         template< class EOT >
         struct ParallelApplyStore : public JobStore< ParallelApplyData<EOT> >
         {
+            using JobStore< ParallelApplyData<EOT> >::_stf;
+            using JobStore< ParallelApplyData<EOT> >::_hrf;
+            using JobStore< ParallelApplyData<EOT> >::_ptf;
+            using JobStore< ParallelApplyData<EOT> >::_iff;
+
             ParallelApplyStore(
                     eoUF<EOT&, void> & _proc,
                     std::vector<EOT>& _pop,
@@ -162,42 +167,28 @@ namespace eo
                    )
                 : _data( _proc, _pop, _masterRank, _packetSize )
             {
-                stpa = new SendTaskParallelApply<EOT>;
-                hrpa = new HandleResponseParallelApply<EOT>;
-                ptpa = new ProcessTaskParallelApply<EOT>;
-                ispa = new IsFinishedParallelApply<EOT>;
+                _stf = new SendTaskParallelApply<EOT>;
+                _hrf = new HandleResponseParallelApply<EOT>;
+                _ptf = new ProcessTaskParallelApply<EOT>;
+                _iff = new IsFinishedParallelApply<EOT>;
             }
 
-            ~ParallelApplyStore()
-            {
-                delete stpa;
-                delete hrpa;
-                delete ptpa;
-                delete ispa;
-            }
-
-            SendTaskParallelApply< EOT >& sendTask() const { return *stpa; }
-            HandleResponseParallelApply< EOT >& handleResponse() const { return *hrpa; }
-            ProcessTaskParallelApply< EOT > & processTask() const { return *ptpa; }
-            IsFinishedParallelApply< EOT >& isFinished() const { return *ispa; }
-
-            void sendTask( SendTaskParallelApply< EOT >* _stpa ) { stpa = _stpa; }
-            void handleResponse( HandleResponseParallelApply< EOT >* _hrpa ) { hrpa = _hrpa; }
-            void processTask( ProcessTaskParallelApply< EOT >* _ptpa ) { ptpa = _ptpa; }
-            void isFinished( IsFinishedParallelApply< EOT >* _ispa ) { ispa = _ispa; }
-
             ParallelApplyData<EOT>* data() { return &_data; }
 
-            protected:
-            // TODO commenter : Utiliser des pointeurs pour éviter d'écraser les fonctions wrappées
-            SendTaskParallelApply<EOT>* stpa;
-            HandleResponseParallelApply<EOT>* hrpa;
-            ProcessTaskParallelApply<EOT>* ptpa;
-            IsFinishedParallelApply<EOT>* ispa;
+            ~ParallelApplyStore()
+            {
+                delete _stf;
+                delete _hrf;
+                delete _ptf;
+                delete _iff;
+            }
 
+            protected:
             ParallelApplyData<EOT> _data;
         };
 
+        // TODO commentaire : impossible de faire un typedef sur un template sans passer
+        // par un traits => complique la tâche de l'utilisateur pour rien.
         template< typename EOT >
         class ParallelApply : public Job< ParallelApplyData<EOT> >
         {
@@ -212,10 +203,6 @@ namespace eo
             {
                 // empty
             }
-
-            protected:
-
-            // bmpi::communicator& comm;
         };
     }
 }
diff --git a/eo/test/mpi/wrapper.cpp b/eo/test/mpi/wrapper.cpp
index c653d5f86..e2bf25d62 100644
--- a/eo/test/mpi/wrapper.cpp
+++ b/eo/test/mpi/wrapper.cpp
@@ -19,16 +19,16 @@ struct plusOne : public eoUF< int&, void >
 template< class EOT >
 struct ShowWrappedResult : public IsFinishedParallelApply<EOT>
 {
-    using IsFinishedParallelApply<EOT>::wrapped;
+    using IsFinishedParallelApply<EOT>::_wrapped;
 
-    ShowWrappedResult ( IsFinishedParallelApply<EOT> * w ) : IsFinishedParallelApply<EOT>( w ), times( 0 )
+    ShowWrappedResult ( IsFinishedParallelApply<EOT> * w = 0 ) : IsFinishedParallelApply<EOT>( w ), times( 0 )
     {
         // empty
     }
 
     bool operator()()
     {
-        bool wrappedValue = wrapped->operator()(); // (*wrapped)();
+        bool wrappedValue = _wrapped->operator()(); // (*_wrapped)();
         cout << times << ") Wrapped function would say that it is " << ( wrappedValue ? "":"not ") << "finished" << std::endl;
         ++times;
         return wrappedValue;
@@ -61,12 +61,11 @@ int main(int argc, char** argv)
     StaticAssignmentAlgorithm assign( v.size() );
 
     ParallelApplyStore< int > store( plusOneInstance, v, 0, 1 );
-    IsFinishedParallelApply< int >& wrapped = store.isFinished();
-    ShowWrappedResult< int >* wrapper = new ShowWrappedResult<int>( &wrapped );
-    store.isFinished( wrapper );
+    store.wrapIsFinished( new ShowWrappedResult<int> );
 
-    // Job< ParallelApplyData<int> > job( assign, 0, store );
     ParallelApply<int> job( assign, 0, store );
+    // Equivalent to:
+    // Job< ParallelApplyData<int> > job( assign, 0, store );
     job.run();
 
     if( job.isMaster() )