diff --git a/ibex_SetBisect.h b/ibex_SetBisect.h
new file mode 100644
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+++ b/ibex_SetBisect.h
@@ -0,0 +1,118 @@
+//============================================================================
+//                                  I B E X                                   
+// File        : ibex_SetBisect.h
+// Author      : Gilles Chabert
+// Copyright   : Ecole des Mines de Nantes (France)
+// License     : See the LICENSE file
+// Created     : 13 juil. 2014
+//============================================================================
+
+#ifndef __IBEX_SET_BISECT_H__
+#define __IBEX_SET_BISECT_H__
+
+#include "ibex_SetNode.h"
+
+namespace ibex {
+
+/**
+ * \ingroup iset
+ * \brief Bisection node (i-set representation)
+ */
+class SetBisect : public SetNode {
+
+public:
+
+	/**
+	 * \brief Create a bisection node
+	 *
+	 * The variable of the nodebox is bisected at point "pt", resulting
+	 * in two subnodes, left and right.
+	 */
+	SetBisect(int var, double pt, SetNode* left, SetNode* right);
+
+	SetBisect(int var, double pt, SetNode* left, SetNode* right,SetNode* father);
+
+	/**
+	 * \brief Delete this
+	 */
+	virtual ~SetBisect();
+
+	/** \see SetNode */
+	virtual bool is_leaf() const;
+
+	/** \see SetNode */
+	virtual SetNode * copy() const;
+
+	/** \see SetNode */
+	virtual void inter(NodeType x_status);
+
+	/** \see SetNode */
+	virtual void _union(NodeType x);
+
+	/** \see SetNode */
+	virtual void oper(SetNode * other,bool op);
+
+	/** \see SetNode */
+	virtual void operator_ir(const IntervalVector& box,const IntervalVector& nodebox, NodeType val,bool op, double eps);
+
+	/** \see SetNode */
+	virtual void operator_ir(const IntervalVector& box,const IntervalVector& subbox, NodeType valin,NodeType valout, bool op,double eps);
+
+	/** \see SetNode */
+	virtual SetNode * fakeLeaf(const IntervalVector& box,const IntervalVector& subbox,NodeType val,bool op, double eps);
+
+	/** \see SetNode */
+	virtual void cleave(const IntervalVector& box, Sep& sep, double eps);
+
+	/** \see SetNode */
+	virtual void gather(bool go_up);
+
+	/** \see SetNode */
+	virtual void cutDeadBranch();
+
+	/** \see SetNode */
+	virtual void checkFat();
+
+	/** \see SetNode */
+	virtual void visit_leaves(leaf_func func, const IntervalVector& nodebox) const;
+
+	/** \see SetNode */
+	virtual void print(std::ostream& os, const IntervalVector& nodebox, int shift) const;
+
+	/** \see SetNode */
+	virtual void setFathers();
+
+
+
+
+
+	/**
+	 * \brief Rerturn left_box according to var, pt and nodebox
+	 */
+	IntervalVector left_box(const IntervalVector& nodebox) const;
+
+	/**
+	 * \brief Rerturn left_box according to var, pt and nodebox
+	 */
+	IntervalVector right_box(const IntervalVector& nodebox) const;
+
+//protected:
+	friend class SetNode;
+	friend class SetInterval;
+
+	// partial initialization used by SetInterval::load only
+	SetBisect(int var, double pt);
+
+
+	int var;
+	double pt;
+	SetNode* left;
+	SetNode* right;
+
+private:
+	SetBisect(const SetBisect&); // forbidden
+};
+
+} // namespace ibex
+
+#endif // __IBEX_SET_BISECT_H__