EVM : EAC = BAC -CV ?

I came across this formula in oliverlehmann. I did not find this in PMBOK or Andy Crowe. 

When to use this formula ? 

How it is different than EAC = BAC /CPI ? 

Thx

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Use EAC = BAC / CPI when variances will continue.

Note: with no variances at all EAC = BAC, and AC = EV, and CPI = 1.

When there are no more variances expected you can use

  • EAC = ( Cost Variance-to-date ) + BAC   
  • EAC = ( AC – EV ) + BAC
  • EAC = AC + BAC - EV