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==Estimation==
Based on the assumption (possibly unwarranted) that a [[''double''-triangular distribution]] governs the data, several estimates are possible. These values are used to calculate an ''E'' value for the estimate and a [[standard deviation]] (SD) where:
: ''E'' = (''a'' + 4''m'' + ''b'') / 6
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''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.
The [[triangular distribution]] is also commonly used. It differs from the double-triangular by having the low, the mode (most likely) and high parameters. The mean (expectation) is then:
: ''E'' = (''a'' + ''m'' + ''b'') / 3.
==Project management==
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