diff --git a/eo/Makefile.am b/eo/Makefile.am
index cb4127aa..1f6b0801 100644
--- a/eo/Makefile.am
+++ b/eo/Makefile.am
@@ -5,3 +5,4 @@
 ###############################################################################
 
 SUBDIRS = src test
+
diff --git a/eo/doc/Makefile.am b/eo/doc/Makefile.am
new file mode 100644
index 00000000..d2936d58
--- /dev/null
+++ b/eo/doc/Makefile.am
@@ -0,0 +1,7 @@
+###############################################################################
+##
+## Makefile.am for eo/doc
+##
+###############################################################################
+
+###############################################################################
diff --git a/eo/src/Makefile.am b/eo/src/Makefile.am
index 0bd70623..eaa8b4f6 100644
--- a/eo/src/Makefile.am
+++ b/eo/src/Makefile.am
@@ -7,4 +7,4 @@
 lib_LTLIBRARIES = libeo.la
 libeo_la_SOURCES =  eoPrintable.cpp eoPersistent.cpp
 libeoincdir = $(includedir)/eo
-libeoinc_HEADERS = eo EO.h eoDup.h eoMultiMonOp.h eoPop.h eoUniform.h eoESChrom.h eoNegExp.h eoProblem.h eoVector.h eoFitness.h eoNormal.h eoRnd.h eoXOver2.h eo1d.h eoID.h eoObject.h eoString.h eoAged.h eoKill.h eoOp.h eoTranspose.h eoBin.h eoPrintable.h eoPersistent.h eoLottery.h eoMutation.h eoPopOps.h eoUniform.h 
+libeoinc_HEADERS = eo EO.h eoDup.h eoMultiMonOp.h eoPop.h eoUniform.h eoESChrom.h eoNegExp.h eoProblem.h eoVector.h eoFitness.h eoNormal.h eoRnd.h eoXOver2.h eo1d.h eoID.h eoObject.h eoString.h eoAged.h eoKill.h eoOp.h eoTranspose.h eoBin.h eoPrintable.h eoPersistent.h eoLottery.h eoMutation.h eoPopOps.h eoUniform.h eoInsertion.h
diff --git a/eo/src/eo b/eo/src/eo
index 7fb1ceb9..0bd7f3bf 100644
--- a/eo/src/eo
+++ b/eo/src/eo
@@ -39,12 +39,19 @@
 #include <eoPop.h>
 #include <eoPopOps.h>
 
-#include <eoFitness.h>  // what's the matter with you?
-#include <eoProblem.h>  // what's the matter with you?
-
 #include <eoLottery.h>
 
-//#include <eoGA.h>
+#include <eoInsertion.h>
+
+
+
+//-----------------------------------------------------------------------------
+// to be continued ...
+//-----------------------------------------------------------------------------
+
+#include <eoFitness.h>  // what's the matter with you?
+#include <eoProblem.h>  // what's the matter with you?
+// #include <eoGA.h>
 
 //-----------------------------------------------------------------------------
 
diff --git a/eo/src/eoInsertion.h b/eo/src/eoInsertion.h
new file mode 100644
index 00000000..f05c29c5
--- /dev/null
+++ b/eo/src/eoInsertion.h
@@ -0,0 +1,49 @@
+//-----------------------------------------------------------------------------
+// eoInsertion.h
+//-----------------------------------------------------------------------------
+
+#ifndef eoInsertion_h
+#define eoInsertion_h
+
+//-----------------------------------------------------------------------------
+
+#include <eo>
+
+//-----------------------------------------------------------------------------
+// eoInsertion
+//-----------------------------------------------------------------------------
+
+template<class Chrom> class eoInsertion: public eoMerge<Chrom>
+{
+ public:
+  /// (Default) Constructor.
+  eoInsertion(const float& _rate = 1.0): eoMerge(_rate) {}
+
+  ///
+  /// @param breeders
+  /// @param pop
+  void operator()(const eoPop<Chrom>& breeders, eoPop<Chrom>& pop)
+    {
+      cout << pop << endl;
+      
+      sort(pop.begin(), pop.end());
+      
+      cout << pop << endl;
+
+      cout << "cte = " 
+	   << (int)(pop.size() * (rate() - 1) - breeders.size()) << endl;
+
+      pop.erase(pop.end() + (int)(pop.size() * (rate() - 1) - breeders.size()),
+		pop.end());
+
+      cout << "cte = " 
+	   << (int)(pop.size() * (rate() - 1) - breeders.size()) << endl;
+
+      copy(breeders.begin(), breeders.end(), 
+	   back_insert_iterator<eoPop<Chrom> >(pop));
+    }
+};
+
+//-----------------------------------------------------------------------------
+
+#endif eoInsertion_h
diff --git a/eo/src/eoPopOps.h b/eo/src/eoPopOps.h
index 7eabb475..cc0a10f9 100644
--- a/eo/src/eoPopOps.h
+++ b/eo/src/eoPopOps.h
@@ -8,7 +8,6 @@
 #ifndef _EOPOPOPS_H
 #define _EOPOPOPS_H
 
-
 using namespace std;
 
 /**
@@ -99,13 +98,13 @@ class eoMerge: public eoObject{
    *  @param breeders Tranformed individuals.
    *  @param pop The original population at the begining, the result at the end
    */
-  virtual operator () (	const eoPop<EOT>& breeders, eoPop<EOT>& pop ) = 0;
+  virtual void operator () (	const eoPop<EOT>& breeders, eoPop<EOT>& pop ) = 0;
   
-  /** @name Methods from eoObject	*/
+  /** @name Methods from eoObject	*/
   //@{
-  /** readFrom and printOn are not overriden
+  /** readFrom and printOn are not overriden
    */
-  /** Inherited from eoObject. Returns the class name.
+  /** Inherited from eoObject. Returns the class name.
       @see eoObject
   */
   string className() const {return "eoMerge";};
@@ -113,6 +112,10 @@ class eoMerge: public eoObject{
   
   /// Return the rate to be selected from the original population
   float rate() const { return rep_rate; }
+
+  /// Set the rate to be obtained after replacement.
+  /// @param _rate The rate.
+  void rate(const float& _rate) { rep_rate = _rate; }
   
 private:
   float rep_rate;