In a CPM analysis if you subtract the early finish from the late finish the result is the activity's slack time.

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Quizplus · Accepted Answer

This statement is true. The slack time for an activity is the amount of time that activity can be delayed without delaying the entire project. It is calculated by subtracting the early finish time from the late finish time for the activity. If the result is zero or negative, then the activity is on the critical path and cannot be delayed without delaying the entire project.

In a CPM Analysis If You Subtract the Early Finish