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EAC stick
by unknown, a long time ago

Estimate At Completion
The EAC gives an idea of the final costs of a project.

Method A:
It means that you basically trust the project's plan (the budget) and consider the project's performance as an accident.
A typical example of such a situation is when a deviation occurs because of an unpredictable cause that isn't expected to have an impact on any other project's work.

Method B:
It takes into account the original budget (BAC), the Earned Value and the Cost Performance Index of the already completed works.
It means that you trust the project's performance the most.
This estimation is used when the reasons for deviations are likely to affect all other project's work

Method C: Balanced Estimate at Completion (link)
Method A uses a factor of 1 and Method B uses CPI as the factor.
Use Method A at the project's start, EACB at the project's and something in between the two factors (1 and CPI) as the project evolves.
EAC = ACWP + ((BAC - BCWP)/(SPI * (CPI - 1) + 1))
That would give an estimation reflecting more confidence on the CPI as the project progresses; and for that you need to define a factor that varies along the project's progress, that is, that varies with the Schedule Performance Index (SPI)

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