Three-point estimation: Difference between revisions

Revision as of 13:35, 19 December 2012

Revision as of 04:50, 28 December 2012

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: ''E'' = (''a'' + 4''m'' + ''b'') / 6

: SD = (''b'' − ''a'') / 6

''E'' is a [[weighted average]] which takes into account both the most optimistic and most pessimistic estimates provided. SD measures the variability or uncertainty in the estimate.

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* Estimates the E value and SD for each task.

* Calculates the E value for the total project work as E (Project Work) = Σ E (Task)

* Calculates the SD value for the total project work as SD (Project Work) = √Σ√(Σ SD (Task) ²)

The E and SD values are then used to convert the project estimates to confidence levels as follows: