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David C. Hay has pioneered the use of process and data models to support strategic planning, requirements analysis, and system design since the late 1970s. In 1993, Dave founded the Houston-based consulting firm Essential Strategies, and, through it, developed enterprise models for many industries, including pharmaceutical research, oil refining and production, film and television, and nuclear energy. His work has been instrumental in identifying the fundamental structure of metadata and has helped hundreds of practitioners address issues of semantics in organization. An internationally revered speaker at conferences on data management, modeling, and semantics, Dave is also author of Requirements Analysis: From Business Views to Architecture (Prentice-Hall, 2002).