diff --git a/eo/src/eoOrderXover.h b/eo/src/eoOrderXover.h
new file mode 100644
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+++ b/eo/src/eoOrderXover.h
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+// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
+//-----------------------------------------------------------------------------
+// eoOrderXover.h
+//-----------------------------------------------------------------------------
+
+#ifndef eoOrderXover_h
+#define eoOrderXover_h
+
+//-----------------------------------------------------------------------------
+
+#include <algorithm>
+#include <utils/eoRNG.h>
+#include <eoInit.h> 
+
+/**
+ * apply orderXover on two chromosomes.
+ * Example:
+ * With 2 parents p1= [1,2,4,3,6,5], p2= [4,5,3,1,6,2]
+ * It applies a random cut between ("|") two indices. Example: the second element and the fourth:
+ * p1 : [1|2,4,3|6,5] and p2 : [4|5,3,1|6,2] generate two children:
+ * c1 = [2,4,3,6,5,1] 2,4,3 taken from p1 and 6,5,1 from p2
+ * c2 = [5,3,1,6,2,4] 5,3,1 taken from p2 and 6,2,4 from p1
+ */
+template<class Chrom> class eoOrderXover: public eoQuadOp<Chrom>
+{
+ public:
+	 /// The class name.
+	 virtual std::string className() const { return "eoOrderXover"; }
+
+	 /**
+	  * @return true if the chromosome has changed
+	  * @param _chrom1 The first chromosome which will be crossed with chrom2.
+	  * @param _chrom2 The second chromosome which will be crossed with chrom1.
+	  */
+	 bool operator()(Chrom& _chrom1, Chrom& _chrom2){
+      
+		 char direction=eo::rng.flip()? 1 : -1;
+		 unsigned cut2= 1 + eo::rng.random(_chrom1.size());
+		 unsigned cut1= eo::rng.random(cut2);
+		 Chrom tmp1= _chrom1;
+		 Chrom tmp2= _chrom2;
+	 
+		 cross(tmp1, tmp2, _chrom1, direction, cut1, cut2);
+		 cross(tmp2, tmp1, _chrom2, direction, cut1, cut2);
+	  
+		 _chrom1.invalidate();
+		 _chrom2.invalidate();
+	  
+		 return true;
+	 }
+  
+ private:
+	 
+	 /**
+	  * @param _chrom1 The first parent chromosome.
+	  * @param _chrom2 The second parent chromosome.
+	  * @param _child The result chromosome.
+	  * @param _direction The direction of the OrderXover (left: -1 or right: 1)
+	  */
+	 void cross(Chrom& _chrom1, Chrom& _chrom2, Chrom& _child, char _direction, unsigned _cut1, unsigned _cut2){
+	 		
+	 	unsigned size, id=0, from=0;
+	 	size= _chrom1.size();
+
+	 	std::vector<bool> verif(size, false);
+	 		
+	 	for(unsigned i= _cut1; i<_cut2; i++){
+	 		_child[id++]= _chrom1[i];
+	 		verif[_chrom1[i] % size] = true;
+	 	}
+	 		
+	 	while(_chrom2[from] != _child[_cut2 - 1])
+	 		from++;
+	 		 		
+	 	for(unsigned i=0; i<size; i++){
+	 		unsigned j= (_direction*i + from + size) % size;
+	 		if(!verif[_chrom2[j] % size]){
+	 			_child[id++]=_chrom2[j];
+	 			verif[_chrom2[j]%size]=true;
+	 		}
+	 	} 		
+	 }
+	 	
+};
+
+#endif