Time study and motion study were developed independently and stood in philosophical tension; the disagreement between Taylor and the Gilbreths became a personal rift that, after Taylor died, turned into an open feud between the Gilbreths and the Taylor camp, and the documented record states that friction over questions of history and intellectual property still remains even after Lillian Gilbreth attempted to heal the rift.
What would resolve this A settled historical account, backed by primary correspondence or patent records, establishing whose methodological contribution founded industrial engineering as a discipline and how the intellectual property dispute between the two camps was actually resolved.
OpenHistory of TechnologyWikipedia contributors, Frank Bunker Gilbreth (Wikipedia)