PPC Calculation

[Anonymous]

Does the PPC Weekly calculation take into account tasks that have been completed ahead of schedule?

e.g. 

Week 1: 4 tasks planned, 3 tasks completed during Week 1 

Week 2: 4 tasks planned, 1 task completed during Week 1

is the PPC for Week 1 calculated as:

3/4 = 75%

or

(3+1)/4 = 100%

If the way PPC is calculated for Week 1 = 75%, then is the task planned for Week 2 but completed in Week 1 included in the Week 2 PPC?

Conversely, if the way PPC is calculated for Week 1 = 100%, then is the task planned for Week 2 but completed in Week 1 excluded in the Week 2 PPC? 

[mike.davison · Accepted solution]

Billy:

Great question! 

In general, PPC measures how reliably you are able to deliver on your commitments.  The general consensus in the Last Planner community is that delivering early is a "failed" commitment just as much as delivering late.  The reasoning is that if you were able to deliver in week 1, why did you commit to delivering in week 2?  Were you "sand bagging"?  And, since the team didn't expect you to complete in week 1, they didn't plan for it.  The next trade contractor who follows your delivery isn't planning to start their work until week 3, so week 2 is a lost opportunity.

To answer your specific question, it depends on how you treat early deliveries.  Some teams will treat an early delivery as an unreliable commitment and mark it "incomplete" (as I explained above). In that case week 1 PPC = 75% (3 out of 4) and week 2 would be 0% (0 out of 4).

Even if you mark the early delivery as "complete", it will not count that until Week 2 is complete, since that's when you committed to deliver it.  Using your example: Week 1 PPC would be 75% (3 out of 4).  Week 2 PPC would be 25% (1 out of 4).

I hope this answers your question.

Mike