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diff --git a/src/theory/quantifiers/quant_relevance.cpp b/src/theory/quantifiers/quant_relevance.cpp
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+++ b/src/theory/quantifiers/quant_relevance.cpp
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+/*********************                                                        */
+/*! \file quant_relevance.cpp
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Andrew Reynolds
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2017 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Implementation of quantifier relevance
+ **/
+
+#include "theory/quantifiers/quant_relevance.h"
+
+using namespace std;
+using namespace CVC4::kind;
+using namespace CVC4::context;
+
+namespace CVC4 {
+namespace theory {
+namespace quantifiers {
+
+void QuantRelevance::registerQuantifier(Node f)
+{
+  // compute symbols in f
+  std::vector<Node> syms;
+  computeSymbols(f[1], syms);
+  d_syms[f].insert(d_syms[f].begin(), syms.begin(), syms.end());
+  // set initial relevance
+  int minRelevance = -1;
+  for (int i = 0; i < (int)syms.size(); i++)
+  {
+    d_syms_quants[syms[i]].push_back(f);
+    int r = getRelevance(syms[i]);
+    if (r != -1 && (minRelevance == -1 || r < minRelevance))
+    {
+      minRelevance = r;
+    }
+  }
+  if (minRelevance != -1)
+  {
+    setRelevance(f, minRelevance + 1);
+  }
+}
+
+/** compute symbols */
+void QuantRelevance::computeSymbols(Node n, std::vector<Node>& syms)
+{
+  if (n.getKind() == APPLY_UF)
+  {
+    Node op = n.getOperator();
+    if (std::find(syms.begin(), syms.end(), op) == syms.end())
+    {
+      syms.push_back(op);
+    }
+  }
+  if (n.getKind() != FORALL)
+  {
+    for (int i = 0; i < (int)n.getNumChildren(); i++)
+    {
+      computeSymbols(n[i], syms);
+    }
+  }
+}
+
+/** set relevance */
+void QuantRelevance::setRelevance(Node s, int r)
+{
+  if (d_computeRel)
+  {
+    int rOld = getRelevance(s);
+    if (rOld == -1 || r < rOld)
+    {
+      d_relevance[s] = r;
+      if (s.getKind() == FORALL)
+      {
+        for (int i = 0; i < (int)d_syms[s].size(); i++)
+        {
+          setRelevance(d_syms[s][i], r);
+        }
+      }
+      else
+      {
+        for (int i = 0; i < (int)d_syms_quants[s].size(); i++)
+        {
+          setRelevance(d_syms_quants[s][i], r + 1);
+        }
+      }
+    }
+  }
+}
+
+} /* CVC4::theory::quantifiers namespace */
+} /* CVC4::theory namespace */
+} /* CVC4 namespace */