- The project schedule for other trades and tasks must be adjusted often, causing overall project delays, increased “Bad Stress” on the project team, or both.
- The actual task itself costs more than budgeted by contractor. At a minimum, the interruption will cost additional mobilization to and from the work area. Remember that about 19% of the labor hours in a typical construction day are spent figuring out what to do, gathering materials, and site movement. When a task is interrupted, you often have to repeat some or all of these non-installation tasks.
Weekly feedback and learning systems are a core element of the Last Planner System because their research showed that tasks not being completed as planned were the single biggest source of poor project performance.