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diff --git a/hw2/include/interval.h b/hw2/include/interval.h
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+/******************************************************************/
+/* This file is part of the homework assignments for CSCI-427/527 */
+/* at The College of William & Mary and authored by Pieter Peers. */
+/* No part of this file, whether altered or in original form, can */
+/* be distributed or used outside the context of CSCI-427/527     */
+/* without consent of either the College of William & Mary or     */
+/* Pieter Peers.                                                  */
+/******************************************************************/
+#ifndef _INTERVAL_H_
+#define _INTERVAL_H_
+
+#include <ostream>
+
+#include "constants.h"
+
+class interval
+{
+ public:
+  //////////////////
+  // Constrructor //
+  //////////////////
+  interval(float lower=-LARGE, float upper=+LARGE);
+  interval(const interval& i);
+
+  ///////////////
+  // Operators //
+  ///////////////
+  interval& operator=(const interval& i);
+
+  interval operator+(float v) const;
+  interval operator-(float v) const;
+  interval operator*(float v) const;
+  interval operator/(float v) const;
+    
+  interval& operator+=(float v);
+  interval& operator-=(float v);
+  interval& operator*=(float v);
+  interval& operator/=(float v);
+
+  ////////////////
+  // Inspectors //
+  ////////////////
+  float lower(void) const;
+  float upper(void) const;
+
+  bool empty(void) const;
+
+  //////////////
+  // Mutators //
+  //////////////
+  void intersect(const interval& i);
+
+  /////////////
+  // Friends //
+  /////////////
+  friend void swap(interval& a, interval& b) { a._swap(b); }
+
+  friend std::ostream& operator<<(std::ostream& s, const interval& i)
+  {
+    s << "[" << i.lower() << ", " << i.upper() << "]";
+    return s;
+  }
+
+ private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  void _assign(const interval& i);
+  void _swap(interval& i);
+
+  //////////////////////////
+  // Private Data Members //
+  //////////////////////////
+  float _lower, _upper;
+};
+
+#endif /* _INTERVAL_H_ */