ITPEC FE Morning October 2022 Question 51

Critical Path Activities — on a critical path, early start equals late start for every activity.

Critical path = longest path through the project network. Activities on it have zero total float.

• •Total float = late start − early start (or late finish − early finish)
• •If float = 0 → early start = late start, early finish = late finish
• •Any delay on a critical path activity delays the entire project

Why not others:
- (a) Can be performed in parallel — possible but not a defining property of critical path
- (b) Non-zero total float — wrong, critical path activities have zero float
- (d) Longest duration activity is on critical path — critical path is the longest path (chain), not the longest single activity

Key rule: Critical path activity → total float = 0 → no schedule flexibility → ES = LS, EF = LF.

AI-generated — may contain errors