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-- name: Slack Time and Critical Path


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If Calculate Using Planned is on, slack time for a task is determined to be:


If Calculate Using Actual is on, slack time for a task is:


Suppose you are using actual dates and days as the unit of duration. If the Actual Start is 11/14/88 and the Latest Start is 
11/17/88, the slack time for the task is three days.

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Critical path is closely related to slack time and hence also affected by whether you are calculating with planned dates or actual dates. MacProject II locates tasks whose slack time does not exceed a certain amount and identifies them as critical.

MacProject II is preset to identify all tasks with a slack of zero or negative units of duration or, if no tasks meet these criteria, the tasks with the least amount of slack. You can change this to a custom critical path threshold.


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Calculations

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Slack Time & Critical Path

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Latest Start – Earliest Start

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Latest Start – Actual Start

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Slack Time

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Critical Path