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diff --git a/hw6/include/reflectanceShader_base.h b/hw6/include/reflectanceShader_base.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 _REFLECTANCESHADER_BASE_H_
+#define _REFLECTANCESHADER_BASE_H_
+
+#include <memory>
+#include "brdf_base.h"
+#include "shader_base.h"
+
+class reflectanceShader_base : public shader_base {
+ public:
+  //////////////////
+  // Constructors //
+  //////////////////
+  reflectanceShader_base(void) {}
+  reflectanceShader_base(const reflectanceShader_base&) = delete;
+
+  ///////////////
+  // Operators //
+  ///////////////
+  reflectanceShader_base& operator=(const reflectanceShader_base&) = delete;
+
+  /////////////
+  // Methods //
+  /////////////
+  virtual color shade(const intersectionPoint& ip, const vec3d& light_dir) const final override;
+
+  virtual color reflectance(const intersectionPoint& ip, const vec3d& light_dir) const final override;
+  virtual brdfSample sample(const intersectionPoint& ip, float r1, float r2) const final override;
+  virtual float reflectivity(const intersectionPoint& ip) const final override;
+  virtual color emittance(const intersectionPoint& ip) const final override;
+
+  virtual shaderProperties properties(const intersectionPoint& ip) const final override;
+
+ protected:
+  ///////////////////////
+  // Protected Methods //
+  ///////////////////////
+  virtual void _print(std::ostream& s) const override = 0;
+
+  virtual std::unique_ptr<const brdf_base> make_brdf(const vec2d& textureCoord) const = 0;
+};
+
+#endif /* _REFLECTANCE_SHADER_BASE_H_ */