In CPM scheduling, what happens to the critical path when an activity on the critical path is completed ahead of schedule?
Correct Answer
B) The critical path may shift to a different sequence of activities
When critical path activities finish early, the critical path may shift to another sequence of activities that now represents the longest path through the network. The critical path is dynamic and can change during project execution.
Why This Is the Correct Answer
The critical path in CPM scheduling is dynamic and represents the longest sequence of activities determining project duration. When a critical path activity finishes early, it may no longer be the constraining factor. Other activity sequences that were previously non-critical may now become the longest path, causing the critical path to shift. This shift reflects the new reality of which activities are actually controlling the project timeline.
Why the Other Options Are Wrong
Option A: The critical path always remains the same
This is incorrect because the critical path is not static. It's a dynamic element that changes based on actual progress versus planned progress. When activities finish early or late, the sequence of activities that determines the project's minimum duration can change, making the critical path variable throughout project execution.
Option C: All activities gain additional float time
This is incorrect because completing a critical path activity early doesn't automatically give all activities additional float time. Only activities that were previously on or near the critical path may gain float. Activities on other paths may remain unaffected, and the new critical path activities will still have zero float.
Option D: The project completion date is automatically reduced
This is incorrect because completing one critical path activity early doesn't automatically reduce the overall project completion date. The project duration is still constrained by the longest remaining path through the network. If another path becomes critical, the project end date may remain unchanged despite the early completion.
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