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6.7. Finish Date Unexpectedly Skewed

Applies to:
@RISK 6.x/7.x, Professional and Standard Editions
@RISK for Project 4.x

The main segments of my project are represented by normal distributions, or other distributions that are symmetric or nearly symmetric. But the finish date of the last task, which is supposed to sum up all of these segments, has a rather large right skew. What is wrong?

Take a closer look at your project to see how predecessor or successor links are affecting the outcome. One way to do this is to insert Predecessor and Successor columns in the Project sheet.

For example, if Task A must finish before its successor, Task B, can begin, then any @RISK distribution on the start time of Task B will be effectively truncated from the left during the simulation, because Task B can never begin before the finish date of its predecessor Task A.

See also: Summary Task Doesn't Sum the Durations of Subtasks.

Last edited: 2015-12-24

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