PMP®:PMI-ACP®:CAPM® - EVM formula - Worked out with Wall example

Cost Variance

CV= EV-AC= 2000-2500 =-$500

(Negative Cost Variance means the project is over budget)

Schedule Variance

SV = EV-PV=2000-3000 = -$1000

(Negative Schedule Variance means the project is behind schedule)

Cost Performance Index

CPI = EV/AC = 2000/2500 = 0.8

(CPI < 1 means the cost performance of the project is not good.

For every $ we spend we are getting the value of $0.8)

Schedule Performance Index

SPI = EV/PV = 2000/3000 = 0.66

(SPI < 1 means the schedule performance of the project is not good.

For every $ we plan , we are completing value of $.66)

EAC formula

A)When original estimate is flawed.

EAC=AC+ETC = 2500+3000 = $5500 (pending work estimate is $3000) 

B)When the current variance will continue in future also.

EAC = BAC/CPI = 4000/0.8 = $5000

(For the 1st 2 feet wall it costed $2500, it would cost the same for the next 2 feet also)

C)When the current variance won't be there in future and pending work will go as per plan.

EAC = AC + (BAC-EV) = 2500+(4000-2000) = $4500

(For the 1st 2 feet wall it costed $2500, but it would cost $2000 for the next 2 feet wall i.e. $1000 per feet as per original budget.) 

D)When both Cost and Schedule constraint influence the pending work.

EAC = AC + [(BAC-EV)/(CPI*SPI)] = 2500+[(4000-2000)/(.8*.66)]=$6287

(Typical Cost variance in future will cost $5000. The schedule will go for 6 days, 3 days for the 1st 2 feet of the wall and 3 more days for the 2nd 2 feet of the wall. What if the schedule constraint of 4 days is insisted? We need to crash the schedule by using additional man power. Hence the additional cost)

Variance At Completion:

VAC=BAC-EAC = 4000-5000=-$1000. 

(EAC calculated as per formula B above.)

To Complete Performance Index:

When BAC was valid

TCPI = Work remaining/funds remaining=(BAC-EV)/(BAC-AC)=(4000-2000)/(4000-2500)=1.33

When BAC is invalid

TCPI = (BAC-EV)/(EAC-AC)=(4000-2000)/(5000-2500)=0.8

(TCPI < 1 means there is not enough fund to complete the pending work)

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