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diff --git a/src/theory/quantifiers/relevant_domain.h b/src/theory/quantifiers/relevant_domain.h
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+/*********************                                                        */
+/*! \file relevant_domain.h
+ ** \verbatim
+ ** Original author: ajreynol
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010, 2011  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief relevant domain class
+ **/
+
+#include "cvc4_private.h"
+
+#ifndef __CVC4__RELEVANT_DOMAIN_H
+#define __CVC4__RELEVANT_DOMAIN_H
+
+#include "theory/quantifiers/first_order_model.h"
+
+namespace CVC4 {
+namespace theory {
+namespace quantifiers {
+
+class RelevantDomain
+{
+private:
+  FirstOrderModel* d_model;
+
+  //the domain of the arguments for each operator
+  std::map< Node, std::map< int, RepDomain > > d_active_domain;
+  //the range for each operator
+  std::map< Node, RepDomain > d_active_range;
+  //for computing relevant instantiation domain, return true if changed
+  bool computeRelevantInstantiationDomain( Node n, Node parent, int arg, std::vector< RepDomain >& rd );
+  //for computing extended
+  bool extendFunctionDomains( Node n, RepDomain& range );
+public:
+  RelevantDomain( FirstOrderModel* m );
+  virtual ~RelevantDomain(){}
+  //compute the relevant domain
+  void compute();
+  //relevant instantiation domain for each quantifier
+  std::map< Node, std::vector< RepDomain > > d_quant_inst_domain;
+};
+
+}
+}
+}
+
+#endif