A project manager is developing the project schedule for a construction project. The team has identified all activities and their dependencies. Which tool should the project manager use to determine the critical path?
CPM calculates the critical path.
Why this answer
The Critical Path Method (CPM) is the correct tool because it calculates the longest path through the project network diagram by analyzing activity durations and dependencies, identifying which activities have zero float and thus determine the project's minimum completion time. The question specifically asks for determining the critical path, which is the core output of CPM, not just visualizing or estimating durations.
Exam trap
The trap here is that candidates confuse PERT with CPM because both use network diagrams, but PERT is for probabilistic duration estimation while CPM is specifically for identifying the critical path via float calculations.
How to eliminate wrong answers
Option A is wrong because the Work Breakdown Structure (WBS) is a hierarchical decomposition of project deliverables and work packages, not a scheduling tool; it does not include dependencies or durations needed to calculate the critical path. Option C is wrong because Program Evaluation and Review Technique (PERT) is a probabilistic method for estimating activity durations using optimistic, pessimistic, and most likely times, but it does not directly determine the critical path; CPM is the deterministic method for that. Option D is wrong because a Gantt chart is a visual bar chart showing activities over time, but it does not perform the forward/backward pass calculations required to identify the critical path; it merely displays the schedule after CPM analysis.