Float (project management)

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Float in project management is the amount of time that a terminal element in a project network can be delayed by, without causing a delay to:

subsequent terminal elements (free float)
project completion date (total float).

An activity that has a total float equal to zero is said to be a 'critical activity', this means that any delay in the finish time of this activity will cause the entire project to be delayed. A critical activity has a free float equal to zero, but the opposite is not always correct.

Sometimes called slack.