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diff --git a/src/Contraction/include/gudhi/Contraction/policies/Contraction_visitor.h b/src/Contraction/include/gudhi/Contraction/policies/Contraction_visitor.h
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+/*
+ * Contraction_visitor.h
+ *
+ *  Created on: Feb 13, 2014
+ *      Author: dsalinas
+ */
+
+#ifndef GUDHI_CONTRACTION_VISITOR_H_
+#define GUDHI_CONTRACTION_VISITOR_H_
+
+#include "gudhi/Contraction/Edge_profile.h"
+#include "boost/optional.hpp"
+
+namespace Gudhi{
+
+namespace contraction {
+
+/**
+ *@class Contraction_visitor
+ *@brief Interface for a visitor of the edge contraction process.
+ */
+template <typename EdgeProfile>
+class Contraction_visitor {//: public Dummy_complex_visitor<typename EdgeProfile::Vertex_handle>  {
+public:
+	//typedef typename ComplexType::GeometryTrait GT;
+	typedef EdgeProfile Profile;
+	typedef double FT;
+	typedef typename Profile::Complex Complex;
+	typedef Complex ComplexType;
+	typedef typename ComplexType::Point Point;
+
+
+	virtual ~Contraction_visitor(){};
+
+	/**
+	 * @brief Called before the edge contraction process starts.
+	 */
+	virtual void on_started (ComplexType & complex){}
+
+	/**
+	 * @brief Called when the StopPredicate returned true (but not if the algorithm terminates because the surface could not be simplified any further).
+	 */
+	virtual void on_stop_condition_reached (const Profile &profile){}
+
+
+	/**
+	 * @brief Called during the collecting phase (when a cost is assigned to the edges), for each edge collected.
+	 */
+	virtual void on_collected (const Profile &profile, boost::optional< FT > cost){}
+
+	/**
+	 * @brief Called during the processing phase (when edges are contracted), for each edge that is selected.
+	 */
+	virtual void on_selected (const Profile &profile, boost::optional< FT > cost, int initial_count, int current_count){}
+
+
+	/**
+	 * @brief Called when an edge is about to be contracted and replaced by a vertex whose position is *placement.
+	 */
+	virtual void on_contracting(const Profile &profile, boost::optional< Point > placement){
+	}
+
+	/**
+	 * @brief Called when after an edge has been contracted onto a new point placement.
+	 * A possibility would to remove popable blockers at this point for instance.
+	 */
+	virtual void on_contracted(const Profile  &profile, boost::optional< Point > placement){
+
+	}
+
+
+	/**
+	 * @brief Called for each selected edge which cannot be contracted because the ValidContractionPredicate is false
+	 */
+	virtual void on_non_valid(const Profile  &profile){}
+
+};
+
+}  // namespace contraction
+
+}  // namespace GUDHI
+
+#endif /* GUDHI_CONTRACTION_VISITOR_H_ */