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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?

About Derek Huether

I'm Vice President of Enterprise Engagements at LeadingAgile. I'm super focused on results. But I also take the hand waving out of organizational transformations. 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)

2 Responses to “2 of 100 Items Missing From the PMBoK”

  1. Derek Huether
    July 9, 2010 at 12:09 am

    After revisiting this, I realized this pertains to statistics. I would have liked to see it referenced but I have made my piece with it.

  2. Derek Huether
    July 8, 2010 at 5:09 pm

    After revisiting this, I realized this pertains to statistics. I would have liked to see it referenced but I have made my piece with it.

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