Project Management guide
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What is Free Slack in Project Management?

Free slack (or free float) refers to how much time a task can be delayed before a subsequent task — or the entire project itself — is likewise delayed. The term is used primarily in the Critical Path Method where a project's critical activities are plotted on a timeline. Free slack or free float therefore shows a task's schedule flexibility, indicating how long before the next sequential task becomes delayed. See also: Critical Path.

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