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Clarence G. Feldmann was a consultant to government and industry, specializing in enterprise engineering and structured methods. With more than forty years of experience in the computer field until his death in 2006, he served on the IDEFU Users Group Steering Committee for many years, and was vice chairman of the Board of Directors of the International Society for Enterprise Engineering (ISEE). As a cofounder with Douglas Ross and Jorge Rodriguez of SofTech, Inc., he participated in the development of SADT (Structured Analysis and Design Technique), a subset of which was adopted by the department of defense as IDEF0.