Formula Archive

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Cost Variance and Project Management Terms

If you’re looking to take the PMP exam, there are several definitions you need to know.  You MUST know and understand the definitions listed in the table below.

The exam won’t come right out and ask you “What does Actual Cost mean?”  The questions are more like:  “What kind of Variance do you have on a deliverable if the Earned Value is $75,000 and the Actual Cost is $77,000?�
I won’t tell you the answer. I will, however, tell you how to figure it out.
Cost Variance (CV) = Earned Value (EV) – Actual Cost (AC).
A negative cost variance means you are over budget.
A positive cost variance means you are under budget.

Term Acronym Definition
AC Actual Cost What is the actual cost realized from the work completed.
BAC Budget at Completion How much was budgeted for the total project?
EAC Estimate at Completion What is currently the expected TOTAL cost of the project?
ETC Estimate to Complete From this point on, how much MORE is it expected to cost to finish the project?
EV Earned Value What is the estimated value of the work actually completed?
PV Planned Value What is the estimated value of the work planned to be completed?
VAC Variance at Completion How much over or under budget is the project expected to be at the end?

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PERT Formula

PERT – Program Evaluation and Review Technique.
If you’re going to take the PMP exam, you MUST remember this formula.  I’ve used it countless times in the real world and it works with surprising accuracy.

Formula: (P+4M+O)/6

Optimistic time (O): the minimum possible time required to accomplish a task, assuming everything proceeds better than is normally expected.
Pessimistic time (P): the maximum possible time required to accomplish a task, assuming everything goes wrong (excluding major catastrophes).
Most likely time (M): the best estimate of the time required to accomplish a task, assuming everything proceeds as normal.

How does it work?

Obtain three time estimates (optimistic, pessimistic, and most likely) for every activity along the critical path.  Plug your numbers into the formula and then sum the totals.  Though people will challenge you, you WILL have a more accurate critical path estimate.

I will speak to “Standard Deviation of an Activity” and “Variance of an Activity” at a later time.   They both leverage the same values but in different formulas.

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