In Critical Path Method (CPM) scheduling, what is the float time for activities on the critical path?
Correct Answer
A) Zero
Activities on the critical path have zero float time, meaning any delay in these activities will directly delay the project completion date. This is a fundamental principle of CPM scheduling.
Why This Is the Correct Answer
Activities on the critical path have zero float time by definition in CPM scheduling. Float time represents the amount of time an activity can be delayed without affecting the project completion date. Since critical path activities directly determine the project duration, any delay in these activities will immediately push back the project completion date, leaving no room for delay (zero float).
Why the Other Options Are Wrong
Option B: Equal to the project duration
Float time is not equal to project duration. Project duration is the total time from start to finish, while float is the allowable delay for individual activities. Non-critical activities may have float time that varies but is never equal to the entire project duration.
Option C: Calculated based on resource availability
Float time is a mathematical calculation based on activity dependencies and durations, not resource availability. While resource constraints can affect scheduling, float is determined by the difference between early start/finish and late start/finish times in the network diagram.
Option D: Determined by the project manager's discretion
Float time is not subjectively determined by project managers. It is objectively calculated through CPM network analysis using mathematical formulas. Project managers use this calculated information but do not arbitrarily assign float values.
Memory Technique
Think 'CRITICAL = ZERO WIGGLE ROOM' - activities on the critical path are so important that there's zero time to wiggle or delay without affecting the whole project.
Reference Hint
Look up 'Critical Path Method' or 'Project Scheduling' in construction management textbooks, typically found in project management chapters (Chapter 4-6 in most texts)
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