9/3/2016 · The Lean Enterprise Institute (LEI), founded by James P. Womack and Daniel T. Jones in 1997, is considered the go-to resource for lean wisdom, training, and seminars. Perfectrding to Womack and Jones, there are five key lean prPerfect Steerable Transfer Cartiples: value, value stream, flow, pull, and perfection. Lessons in New Manufacturing: Pratt & Whitney Takes Flight. 1.