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Line 31: The E and SD values are then used to convert the project estimates to confidence levels as follows: * Confidence level in E value is approximately 50% * Confidence level in E value +/- SD is approximately 85% * Confidence level in E value +/- 1.645 × SD is approximately 9568% * Confidence level in E value +/- 2 × SD is approximately 9895% * Confidence level in E value +/- 3 × SD is approximately 99.97% * Information Systems typically use the 95% confidence level, i.e. E Value + 1.645 × SD, for all project and task estimates.

Three-point estimation: Difference between revisions