In four papers authored by Howell and Ballard in the 1994 Lean Construction conference in Santiago, Chile (Ballard and Howell, 1994a, 1994b; Howell and Ballard, 1994a, 1994b), we introduced the idea of creating a buffer of ready work from which front line supervisors could select tasks and place them on weekly work plans as commitments. We also shared what had been done on the Koch MidPlants project to ensure that materials were available. What we did not do was provide a more detailed description of how to create the buffer of ready work.