Claim: The flow process chart was introduced by Frank and Lillian Gilbreth to members of ASME in 1921, then in the 1930s, an industrial engineer, Allan H. Mogensen ( American industrial engineer, and industry consultant) began training business people in the use of some of the tools of industrial engineering at his Work Simplification Conferences in Lake Placid, New York.
Evidence: The first structured method for documenting process flow, e.g. in flow shop scheduling, the flow process chart, was introduced by Frank and Lillian Gilbreth to members of ASME in 1921 as the presentation "Process Charts, First Steps in Finding the One Best Way to Do Work". In the early 1930s, an industrial engineer, Allan H. Mogensen began training business people in the use of some of the tools of industrial engineering at his Work Simplification Conferences in Lake Placid, New York. Allan Herbert Mogensen, known as Mogy, (May 12, 1901 - March 1989) was an American industrial engineer, and industry consultant, and an authority in the field of work simplification and office management.