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# TOPIC: QuestionETC

## ETC 3 years 1 month ago #5064

 Simon Ngembu Topic Author Offline Fresh Boarder Posts: 6 Thank you received: 0 Variance at Completion (VAC) The VAC will tell you one thing: How much over or under budget will you be, when the project is done. The good news is, that there is only one formula to know: VAC = BAC-EAC All in all, there is no easy way to remember these forecasting formulas. You must memorize them and you must also memorize in which circumstances to use them. You simply have to know them. So if I tell you: "Variances on your project are typical. How do you calculate the ETC?" You have to be able to tell me that the formula is: ETC = (BAC-EV) / CPI Q.Please can someone explain to me why ETC=(BAC-EV)/CPI in the example provided above( under Variance at complition) Thanks in Advance, 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.

## ETC 3 years 1 month ago #5067

 Rahul Kakkar Offline Gold Boarder Posts: 161 Karma: 6 Thank you received: 47 Hi Simon, There are three ways you can calculate ETC 1. Atypical - Wherein you absorb the variance. That means whatever cost variances you have observed until that point, they will NOT continue further as they were an exception and as such the remaining work will be done within the original budget for that work. 2. Typical - here you take the new trend into account. Which is what's the case in your example above. In this case you expect the newly calculated cost variance to remain the same until the entire work is completed and accordingly increase or decrease the budget for the remaining work. Therefore in this case, the remaining work (BAC-EV) divided by the new CPI will give you the ETC. 3. Erroneous - this is case where in you realise your estimations were all wrong and basically you re-estimate all of them based on your remaining work. Let me know if you need further clarification. I hope I was clear in my explanation. 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. Rahul Kakkar, PMP, MBA Community Moderator How are we doing? Your opinion matters. To help us improve, please check out our survey at www.surveymonkey.com/s/pmpexamforum

## ETC 3 years 1 month ago #5070

 Ahmed Amin Offline Gold Boarder Posts: 300 Karma: 7 Thank you received: 72 Hi Simon, If you are a customer of the PM PrepCast I highly recommend that you watch the earned value management videos on this (L07.05.1 , L07.05.2). It is very clear and contains all the information you need for the exam, also it will make you understand the formulas. ETC is the Estimate to Complete, it is the estimated cost to finish all the remaining project work. calculating ETC has 2 formulas: 1. Assuming work is proceeding on plan, ETC = EAC – AC where EAC is the Estimate at Completion and AC is the Actual Cost. 2- assuming work is not going as planned in such case ETC is simply the re-estimate of the remaining work. ETC = Re-Estimate. Regarding the EAC, you will need to calculate this to come up with ETC, it is the expected total cost of completing all work expressed as the sum of the actual cost to date and the estimate to complete. based on the situation and the current project status, EAC has the below formulas. 1. If the CPI is expected to be the same for the remainder of the project, EAC = BAC/CPI 2. If the future work will be accomplished at the planned rate, EAC = AC + BAC – EV 3. If the initial plan is no longer and you will have to estimate, EAC = AC + Bottom-up ETC 4- If both the CPI and SPI influence the remaining work, EAC = AC + [(BAC – EV)/ (CPI x SPI)] In the example you referred to ETC = EAC - AC where EAC = AC + [(BAC – EV)/ (CPI x SPI)] and if we substitute both equations you will come up with ETC = (BAC-EV) / (CPI x SPI) and for some reason your example assumed SPI is 1 or just ignored it and came up with ETC = (BAC-EV) / CPI I hope this will help you understand these formulas. 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. The following user(s) said Thank You: Simon Ngembu Ahmed Amin Abdullah, PMP Community Moderator

## ETC 3 years 1 month ago #5073

 Simon Ngembu Topic Author Offline Fresh Boarder Posts: 6 Thank you received: 0 Thanks Ahmed I appreciate your input 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.

## ETC 3 years 1 month ago #5074

 Simon Ngembu Topic Author Offline Fresh Boarder Posts: 6 Thank you received: 0 Hi Rahul, Thanks for your input. I didn't know of Atypical and Typical. Now I have an idea. Q. ETC= EAC- AC, can ETC= BAC -AC assuming work is going on as planned? because in this case EAC=BAC? 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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