# Typical vs Atypical in EV

Submitted by pmplearner1977 on Thu, 03/21/2013 - 13:41

Typical - No variances. No variances will occur in the FUTURE. BAC/CPI(cumu)

Atypical - Variances has occured but will not occur in the FUTURE. AC + (BAC - EV)cO

Please correct me if my interpretation is wrong.

Forums:

pmpnewster

Thu, 03/21/2013 - 13:52

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## I presume the left hand side

I presume the left hand side of your formula equations to be 'EAC = '. Am I right?

What is the 'cO' to the very end in your second formula?

pmplearner1977

Thu, 03/21/2013 - 14:50

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## Re

Yes EAC. Co is some typo.

AP

Thu, 03/21/2013 - 15:04

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## Concept

We shall try to understand the meaning of typical & atypical.

Typical - Some variances have occured and it is

expectedto continue in future too.Atypical - Some variances have occured and it is

not expectedto continue in future.Formulae:EAC

‘fundamentally flawed’= AC + ETCEAC

‘Typical’= BAC / CPIEAC

‘atypical’= AC + (BAC – EV)EAC considering both CPI & SPI = AC + [(BAC-EV)/(CPI*SPI)]

bkthakkar

Fri, 03/22/2013 - 08:18

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## true and agree to it

true and agree to it completely.

pmplearner1977

Wed, 03/27/2013 - 23:03

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## AP,As per the Abhi and

AP,

As per the Abhi and Rajesh Nair cheat sheet, i could see the following formulas. For typical and atypical it is different thant what you said. Please clarify my doubts

CV = EV - AC

CPI = EV / AC

SV = EV - PV

SPI = EV / PV

EAC

‘no variances’= BAC / CPIEAC

‘fundamentally flawed’= AC + ETCEAC

‘atypical’= AC + BAC - EVEAC

‘typical’= AC + ((BAC - EV) / CPI)ETC = EAC - AC

ETC

‘atypical’= BAC - EVETC

‘typical’= (BAC - EV) / CPIETC

‘flawed’= new estimatePercent Complete = EV / BAC * 100

VAC = BAC - EAC

EV = % complete * BAC

Formula for

TCPIto meet theBACis:TCPI = (BAC-EV) / (BAC-AC)Formula for

TCPIto meet theEACis:TCPI = (BAC – EV) / (EAC – AC)AP

Thu, 03/28/2013 - 10:12

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## Hi

EAC = AC + (BAC-EV)/CPI is the formula that was given in PMBOK guide third edition.

In fourth edition, the same formula is simplified to EAC = BAC / CPI. Both the formulae are correct.

Kindly refer this url which clearly derives the equation.

http://www.deepfriedbrainproject.com/2010/01/solving-estimate-at-completion-puzzle.html

bpatel

Fri, 03/29/2013 - 03:08

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## For everyone who has to yet

For everyone who has to yet give PMP Exam, Please remember all the formulas. I had so many mathematical questions in the exam and not all are straightforward. Understanding EAC and ETC is very important for exam

pmalik

Mon, 03/12/2018 - 07:10

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## Typical and Atypical

You can read the following articles to understand more about Typical and Atypical Scenarios -

https://www.pmbypm.com/earned-value-management-system-explained-easy-lan...

https://www.pmbypm.com/estimate-at-completion-eac-formula/

https://www.pmbypm.com/estimate-to-complete-etc-formula/