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Object-oriented features such as encapsulation, inheritance, and state dependent behavior raise new problems in softwan testing. In this paper, we describe a reverse engineering appmch for software testing of object-orienied pmgmms. The approach is based on a gmphic model which consists of three types of diagmms: object relation d i a p m , block branch diagram, and object state diagram. These diagmms may be used to 1) provide guidance on the order to test the classes and member functions; 2) prepare member function test cases; 3) prepare test cases for object state dependent hehaviors and intemction between such behaviors; and 4) provide graphic display of coverage information to a tester.