Takt time is a design parameter used in production settings, be it manufacturing or construction, tuning the rate of work output to the customer's rate of demand. Recent industry experiments have shown that takt-time planning and execution of construction work can yield significant benefits in regards to time savings, money savings, improved quality, etc. In this paper we describe our actionresearch implementation of takt-time planning by means of a case study on an approximately $2.5 million

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... trofit of a floor in an operating healthcare facility. We illustrate the takt-time planning process using excerpts from one-on-one meetings with subcontractors on the integrated project delivery team. The commercial terms combined with these subcontractors' willingness to express flexibility in their means and methods, as well as sequencing of work, made it possible to trade off pains and gains among team members for the sake of optimizing the project's takt-time plan. We situate the takt-time planning process in the context of the levels of the Last Planner System, comprising Master Scheduling, Reverse Phase Scheduling, Makeready Planning and Commitment Planning. Execution of the take-time plan is underway. We conclude that takt-time planning helps to pose many questions that must be answered in production system design.