Planned workDone, as at the hand
Critical chainProject bufferPast the keys date
◆ state reached · ◇ state to come
Backcast test · canonical clock · floor 10
A four-bedroom detached house in the West Midlands, planned backwards from the keys. Each of 455 jobs sits at the smallest period that contains it on the clock, and ten hands hold their commitments at the same addresses.
Sources: Robinson, backcasting (1982); the prerequisite tree in Goldratt's thinking processes; Ballard, The Last Planner System of Production Control (University of Birmingham, 2000); the five conversations; buffer sizing in critical chain; inspection stages from a council building control page. The house, its durations and the 200 builds are a model, not a real site.
All the animations · Sundial House, the introduction · The same plan on the beach, trade by trade