HKSM

The chain of activities that makes up the longest route through the schedule; its total duration sets the minimum time needed to finish the project.

Key Points

• Activities on the critical path have zero total float; any delay on them delays the project finish.
• There can be more than one critical path at the same time, which increases schedule risk.
• The critical path can change as estimates, logic, or actual progress are updated; recalculate it regularly.
• To shorten the overall timeline, focus on critical-path work using crashing or fast tracking.

Example

A project has two paths: A-B-C totaling 30 days and D-E totaling 18 days. A-B-C is the critical path. If task B slips by 2 days, the whole project finish slips by 2 days unless you compress B or another activity on the critical path.

PMP Example Question

Which statement best defines the critical path in a project schedule?

1. The path with the largest number of activities.
2. The sequence of activities with zero total float whose total duration sets the earliest possible project completion.
3. The set of activities with the highest costs.
4. The path containing tasks with the most risk responses.

Correct Answer: B - The longest-duration path with zero float that sets the minimum project duration

Explanation: Only the longest path with zero total float determines the earliest achievable finish date; other paths have float and do not control project completion.