Enterprise Model Patterns: Describing the World (UML Version)
Since the early 1980s, David Hay has been a pioneer in the use of process and data models to support strategic planning, requirements analysis, and system design.  He has developed enterprise models for many industries, including, among others, pharmaceutical research, oil refining and production, film and television, and nuclear energy. In each case, he found the relatively simple structures hidden in formidably complex situations. Mr. Hay has published several books and numerous articles. He is a frequent speaker at professional society conferences.