diff --git a/scheduler/interval-generator.h b/scheduler/interval-generator.h
new file mode 100644
index 0000000..e480ecc
--- /dev/null
+++ b/scheduler/interval-generator.h
@@ -0,0 +1,33 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ *                     Alexander Afanasyev
+ *                     Zhenkai Zhu
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef INTERVAL_GENERATOR_H
+#define INTERVAL_GENERATOR_H
+
+#include <boost/shared_ptr.hpp>
+
+using namespace std;
+
+class IntervalGenerator;
+typedef boost::shared_ptr<IntervalGenerator> IntervalGeneratorPtr;
+
+class IntervalGenerator
+{
+public:
+  virtual ~IntervalGenerator () { }
+  
+  virtual double
+  nextInterval() = 0;
+};
+
+
+#endif // INTERVAL_GENERATOR_H