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# TOPIC: EAC when to use which formula

## EAC when to use which formula 5 years 7 months ago #12284

 Debbie Dananberg Topic Author Offline Fresh Boarder Posts: 3 Thank you received: 0 I was doing a practice exam and knew the BAC, AC and EV. The question asked to calculate the EAC. I used the formula EAC = AC + BAC - EV. and found my answer. However it was marked wrong and instead the solution used EAC = BAC/CPI . Is there a way to determine when to use one formula vs the other? Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## EAC when to use which formula 5 years 7 months ago #12287

 Ahmed Amin Offline Gold Boarder Posts: 300 Karma: 10 Thank you received: 73 here are the notes from my study log, hope t helps If the CPI is expected to be the same for the remainder of the project, EAC can be calculated using: EAC = BAC/CPI which basically means you expect the future of the project to be the same as the previous period. If future work will be accomplished at the planned rate, use: EAC = AC + BAC – EV which means whatever happened in the past period will not affect the plan of the remaining work. If the initial plan is no longer valid, use: EAC = AC + Bottom-up ETC which means the initial planning turned out invalid and the remaining work will be re-estimated. If both the CPI and SPI influence the remaining work, use: EAC = AC + [(BAC – EV)/(CPI x SPI)] Ahmed Amin Abdullah, PMP Community Moderator The following user(s) said Thank You: Debbie Dananberg, S Malani, Kanika Saxena Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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