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Schedulingaka: CPaka: longest path

Critical Path

In Plain English

The longest chain of tasks in a project schedule where any delay will push back the completion date.

Definition

The critical path is the longest sequence of logically linked activities in a project network whose total duration determines the project's earliest possible completion date. Activities on the critical path have zero total float, meaning any delay to a critical path activity directly delays the project completion date. Identifying and managing critical path activities is the primary focus of construction schedule management.

Why It Matters in Bidding

The critical path tells you which activities actually control the completion date, so it drives how you sequence subs, stage crews, and load your bid's general conditions and overhead duration. Misjudging it during bidding can lead to understated time-related costs or unrealistic milestone commitments that expose you to liquidated damages.

Example

Before bidding, the estimator reviews the schedule and sees that the long-lead switchgear sits on the critical path, so he prices expedited submittals and an earlier procurement allowance to protect the completion date.

Related Terms

Critical Path Method (CPM)FloatBaseline ScheduleNetwork Diagram

Frequently Asked Questions

It defines project duration, which sets your time-related general conditions, supervision, equipment rental, and bond costs. Knowing which scopes control the finish date lets you sequence subs realistically, price long-lead procurement, and avoid committing to milestones you cannot meet without acceleration costs.
Yes. As activities finish early or late and durations shift, float gets consumed and a previously non-critical chain can become the new controlling sequence. This is why schedule updates matter: the critical path is recalculated each cycle, and delay claims hinge on which path was controlling at the time.
Zero total float means those activities have no scheduling slack: any delay pushes the completion date out day-for-day. Non-critical activities carry positive float and can slip somewhat without affecting the finish. Managers focus protection, resources, and recovery efforts on the zero-float chain first.

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