A lean planning method in which the people who do the work plan it together, week by week, and measure the share of promises kept (percent plan complete).
The Last Planner System (LPS) is a production planning method from lean construction, developed by Glenn Ballard and Greg Howell and promoted by the Lean Construction Institute. Its central idea is that the "last planners", the foremen and trade supervisors who direct the work, plan it together and commit only to tasks that are ready to be done. Progress is measured by how many of those commitments are kept each week.
LPS is used on sites of every size, often on a physical board in the site cabin. Models help in two places: in pull planning, where a 4D view of a zone makes the sequence and the handoffs visible, and in the look-ahead, where the model shows which design information or which prefabricated parts are still missing. Constraint logs can be linked to model elements so that the coordinator sees what is blocking the site.
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