2 of 100 Items Missing From the PMBoK

Missing VAC FormulaVariance At Completion (VAC) is the difference between what the project was originally expected (baselined) to cost, versus what it is now expected to cost.

Every month, our vendor is required to report this total on the project as a whole and on key deliverables.  I’m used to seeing the numbers reported and how to calculate them.  I’m not asking for the Cost Performance Index (CPI).  I want to know how far over or under we’re going to be compared to the budget.

The formula I memorized for the PMP exam and the same formula I use to calculate VAC today is: Variance At Completion = Budget At Completion – Estimate At Completion
(VAC = BAC – EAC)

So, I ask myself, [1] why is there no VAC definition and [2] VAC formula in the PMBoK?

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About Derek Huether

I'm an Enterprise Agile Coach at LeadingAgile. I have a goal to take the hand waving out of Agile, Kanban, & Scrum. I’m a strange combination of a little OCD, a little ADHD, a lot of grit, and a lot of drive. I come from a traditional PM background but I don't give points for stuff done behind the scenes. The only thing that counts is what you get done and delivered. Author of Zombie Project Management (available on Amazon)