A key component of using the Last Planner System involves the team holding themselves accountable for missed commitments. When there is a “miss”, the team should perform the Five Why or Root Cause Analysis process to understand the underlying reason(s) why.
Is labor consistently a problem? Or are submittals repeatedly holding things up? It is helpful to categorize these reasons to enable the tracking of trends over time to address the most significant sources of unreliable commitments.
1- Poor Planning (unrealistic initial estimates, unidentified constraint)
2- Lack of Coordination (not understanding level of detail required by trades, misaligned expectations, competing priorities)
3- Prerequisite Design Work Not Complete
4- Study or Technical Data Not Provided
5- Late Stakeholder Comments
6- People Not Available
7- Key Members Not On Board At Same/Right Time (new members not up to speed)
8- Contracts / Change Orders
9- Third Party Influence (AHJ, regulatory bodies – but make sure it’s not just #1 or #2!)
10- I Forgot (lost track of plan)
11- No Update (missing Info: may or may not have been late)
12- Unforeseen Conditions
13- Other (explain – but make sure it’s really a separate reason for variance, have you done 5-Why?)