Critical Path Method (CPM) analyzes task dependencies, durations, and sequencing to determine which activities have zero slack and therefore cannot be delayed without extending the overall project timeline. Activities on the critical path receive priority attention and resource allocation since any delay directly impacts project completion. For example, in construction, foundation work typically sits on the critical path because framing cannot begin until it completes. Project managers use CPM to optimize schedules, allocate resources effectively, and identify where crashing (adding resources) will most efficiently accelerate delivery. The technique provides quantitative basis for schedule risk assessment and management.