"As Head of the Computer Application Group at the MIT Electronic Systems Laboratory, Doug led the development of the (APT), a special purpose programming language that became the world standard for programming computer-controlled machine tools. He then turned his attention to the development of a and supporting tools. This led to the development while at MIT of the first software engineering language and supporting tools, the AED system. In 1969 Doug founded where he continued to work on software engineering standards. While at SofTech, Doug conceived of SA, a graphic notation and methodology for system description. SA has been successfully applied worldwide as SofTechs (SADT) or as the U.S. government standard ."