IDEF1 was developed under ICAM program priority 1102 by Robert R. Brown of the Hughes Aircraft Company, under contract to SofTech, Inc. Brown had previously been responsible for the development of IMS while working at Rockwell International. Rockwell chose not to pursue IMS as a marketable product but IBM, which had served as a support contractor during development, subsequently took over the product and was successful in further developing it for market. Brown credits his Hughes colleague Timothy Ramey as the inventor of IDEF1 as a viable formalism for modeling information structures. The two Hughes researchers built on ideas from and interactions with many luminaries in the field at the time. In particular, IDEF1 draws on the following techniques: