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Bruce Powel Douglass is the Chief Evangelist for i-Logix, a leading producer of tools for real-time systems development. He contributed to the original specification of the UML and is one of the co-chairs of the Object Management Groupis Real-Time Analysis and Design Working Group. He also consults for a number of companies and organizations, including NASA, on building large-scale, real-time, safety-critical systems. He is the author of four other books, including Doing Hard Time: Developing Real-Time Systems with UML, Objects, Frameworks, and Patterns (Addison-Wesley).