In CPM scheduling, what happens to the project duration when an activity on the critical path is delayed?
Correct Answer
C) Project duration increases by the same amount as the delay
Activities on the critical path have zero float, so any delay in a critical path activity directly increases the project duration by the same amount. This is why critical path activities require careful monitoring.
Why This Is the Correct Answer
Activities on the critical path have zero float (slack time), meaning there is no buffer time available to absorb delays. When any activity on the critical path is delayed, that delay directly extends the overall project completion date. Since the critical path determines the minimum project duration, any delay to critical path activities automatically increases the total project duration by exactly the same amount as the delay.
Why the Other Options Are Wrong
Option B: Project duration remains unchanged
This is incorrect because critical path activities have no float to absorb delays. Any delay to a critical path activity must extend the project duration since these activities determine the longest path through the project network.
Option D: Project duration decreases due to schedule compression
This is incorrect because delays cannot cause schedule compression or duration decreases. A delay by definition extends time, and critical path delays specifically extend the overall project duration.
Memory Technique
Think 'Critical = No Cushion' - critical path activities have no time cushion (float), so any delay hits the project finish date directly, like a domino effect with no buffer to stop it.
Reference Hint
Look up CPM (Critical Path Method) scheduling in the project management or scheduling chapter of your contractor reference manual, specifically the section on float/slack calculations.
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