ITPEC FE Morning October 2018 Question 53

Any activity on the critical path is a critical path activity — the only statement here that is true by definition.

The critical path is the longest chain of dependent activities from start to finish. Its total length is the shortest time in which the whole project can be completed, and its activities have zero total float, so delaying any of them delays the project. Each of these activities is called a critical path activity.

Answer (a)

Why not others:

• •(b) — the critical path is the longest path through the network, not the shortest
• •(c) — the path is chosen by the total duration of a chain, so the single longest activity may lie on a path with plenty of float
• •(d) — the sum of the critical path durations is the minimum project duration, the earliest the project can finish, not the longest possible one

Key rule: The critical path is the longest path, and its length is the shortest possible project duration; confusing the two is the usual trap.

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