diff --git a/eo/src/eoRandomSelect.h b/eo/src/eoRandomSelect.h
index 651174e8..4265cc9d 100644
--- a/eo/src/eoRandomSelect.h
+++ b/eo/src/eoRandomSelect.h
@@ -40,20 +40,21 @@
  * eoRandomSelect: an selection operator, which selects randomly a percentage
  of the initial population.
  */
-template<class EOT> class eoRandomSelect: public eoSelect<EOT>
+template<class EOT> class eoRandomSelect: public eoBinPopOp<EOT>
 {
  public:
   ///
-  eoRandomSelect(const float& _percent = 0.4): eoSelect<EOT>(), rate(_percent) {};
+  eoRandomSelect(const float& _percent = 0.4): 
+    eoBinPopOp<EOT>(), repRate(_percent) {};
   
   ///
   virtual ~eoRandomSelect() {};
   
   /// Takes a percentage of the population randomly, and transfers it to siblings
-  virtual void operator() ( const eoPop<EOT>& _parents, eoPop<EOT>& _siblings ) const {
+  virtual void operator() ( eoPop<EOT>& _parents, eoPop<EOT>& _siblings )  {
     // generates random numbers
     eoUniform<unsigned> uniform(0, _parents.size()-1);
-    unsigned num_chroms = (unsigned)(rate * _parents.size());
+    unsigned num_chroms = (unsigned)(repRate * _parents.size());
 
     // selection of chromosomes
     do {
@@ -69,7 +70,7 @@ template<class EOT> class eoRandomSelect: public eoSelect<EOT>
    * @param _s A istream.
    */
   virtual void readFrom(istream& _s) {
-	_s >> rate;
+	_s >> repRate;
   }
 
   /** Print itself: inherited from eoObject implementation. Declared virtual so that 
@@ -77,7 +78,7 @@ template<class EOT> class eoRandomSelect: public eoSelect<EOT>
 	  base classes, so you donīt have to worry about, for instance, fitness.
   @param _s the ostream in which things are written*/
   virtual void printOn( ostream& _s ) const{
-	_s << rate;
+	_s << repRate;
   }
 
   /** Inherited from eoObject 
@@ -89,7 +90,7 @@ template<class EOT> class eoRandomSelect: public eoSelect<EOT>
 
 
  private:
-  float rate;
+  float repRate;
 };
 
 //-----------------------------------------------------------------------------
diff --git a/eo/src/eoTournament.h b/eo/src/eoTournament.h
index c71e16ad..dad95654 100644
--- a/eo/src/eoTournament.h
+++ b/eo/src/eoTournament.h
@@ -38,12 +38,12 @@
 @author JJ Merelo, 1998
 */
 template<class EOT>
-class eoTournament:public eoSelect<EOT>{
+class eoTournament:public eoBinPopOp<EOT>{
 public:
 
   /// Proportion of guys that are going to be eliminated
-  eoTournament( float _perc, unsigned _tSize): eoSelect<EOT>(), 
-	  perc( _perc), repTournamentSize(_tSize){};
+  eoTournament( float _perc, unsigned _tSize): 
+    eoBinPopOp<EOT>(), perc( _perc), repTournamentSize(_tSize){};
 
   /// Virtual dtor
   ~eoTournament(){};
@@ -55,7 +55,7 @@ public:
    * Selects from the initial pop using tournament selection, and copies it
    * to the other population.
    */
-  virtual void operator() ( const eoPop<EOT>& _vEO, eoPop<EOT>& _aVEO) const {
+  virtual void operator() ( eoPop<EOT>& _vEO, eoPop<EOT>& _aVEO)  {
     
     unsigned thisSize = _vEO.size();