American Institute Of Constructors (AIC) Level 1 Practice Test

What is the free float for activity E?

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Correct Answer:

Explanation:

Free float is the amount of time an activity can be delayed without delaying the early start of its immediate successor(s). It’s found by comparing when the next activities must start with when this activity finishes: Free float = (earliest start of successors) − (finish of this activity). If the earliest start of every successor is exactly the finish time of this activity, there is no room to delay it without pushing a successor’s start. That makes the free float zero. In this situation, delaying E would push at least one successor’s start, so E has no slack. If there were a gap between E’s finish and its successors’ earliest starts, the difference would be positive, giving a positive free float.

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