In Critical Path Method (CPM) scheduling, what is the total float for activities that lie on the critical path?
Correct Answer
C) Zero
Activities on the critical path have zero total float because any delay in these activities will directly delay the project completion date. This is the defining characteristic of the critical path.
Why This Is the Correct Answer
Activities on the critical path have zero total float by definition because they represent the longest sequence of activities through the project network. Any delay in a critical path activity will directly extend the project completion date since there is no buffer time available. Total float represents the amount of time an activity can be delayed without affecting the project completion, and since critical path activities cannot be delayed without impacting the project, their total float is zero.
Why the Other Options Are Wrong
Option B: Equal to the project duration
Negative float can occur when projects are behind schedule, but critical path activities don't 'always' have negative float. In a properly planned project, critical path activities start with zero float, and negative float only appears when the project is delayed beyond its required completion date.
Option D: Always negative
Total float being equal to project duration is incorrect because float represents available delay time for individual activities, not the entire project timeline. Activities with float equal to project duration would essentially be optional or could start at project end, which doesn't make logical sense in a construction sequence.
Memory Technique
Think 'Critical = Crisis' - any delay in critical activities creates a crisis (project delay) because there's zero cushion time available.
Reference Hint
Look up CPM scheduling and critical path analysis in the project management or scheduling chapter of your contractor reference manual
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