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diff --git a/courgette/adjustment_method.h b/courgette/adjustment_method.h
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+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COURGETTE_ADJUSTMENT_METHOD_H_
+#define COURGETTE_ADJUSTMENT_METHOD_H_
+
+#include "base/basictypes.h"
+
+namespace courgette {
+
+class AssemblyProgram;
+
+class AdjustmentMethod {
+ public:
+  // Factory methods for making adjusters.
+
+  // Returns the adjustment method used in production.
+  static AdjustmentMethod* MakeProductionAdjustmentMethod();
+
+  // Returns and adjustement method that makes no adjustments.
+  static AdjustmentMethod* MakeNullAdjustmentMethod();
+
+
+  // Adjusts |program| to increase similarity to |model|.  |program| can be
+  // changed in any way provided that it still produces the same output when
+  // assembled.
+  virtual bool Adjust(const AssemblyProgram& model,
+                      AssemblyProgram* program) = 0;
+
+  // Deletes 'this' adjustment method.
+  virtual void Destroy();
+
+ protected:
+  AdjustmentMethod() {}
+  virtual ~AdjustmentMethod() {}
+
+  DISALLOW_COPY_AND_ASSIGN(AdjustmentMethod);
+};
+
+}  // namespace courgette
+#endif  // COURGETTE_ADJUSTMENT_METHOD_H_