Critical path
The critical path is the longest chain of dependent tasks in a schedule, so any delay to a task on it delays the whole project finish date.
The critical path is the longest chain of dependent tasks in a schedule, so any delay to a task on it delays the whole project finish date.
What critical path means
The critical path is the sequence of tasks that determines the earliest possible completion date. Each task depends on the one before it, and the chain has no spare time (zero float). If any task on it slips, the finish date slips by the same amount.
The method used to find it is called the critical path method (CPM).
A plain example
Imagine a schedule where foundations, then frame, then enclosure, then fit-out form one chain, while landscaping runs in parallel with spare time. The foundation-to-fit-out chain is critical; landscaping is not. Durations in any sketch are illustrative.
Why it matters
Knowing the critical path tells managers where attention and resources have the most effect. It also shows how a late item, such as a long-lead item, becomes a project-level delay. Paths shift as tasks finish early or late, so update the schedule regularly.
Common confusion
Critical does not mean important; a vital but flexible task can have float. Also, the longest lead time is not automatically the critical path. Methods such as those described by transport agencies and scheduling bodies vary in detail, so follow the contract’s scheduling specification.
Practical checklist
Using the critical path well depends on schedule quality and regular updates.
- Build the schedule with logical links, not fixed dates, so the path can be calculated.
- Identify the path after each update and see which tasks lack float.
- Look at near-critical paths, since small delays can move them to the top.
- Tie procurement tasks to the schedule so late deliveries show their effect.
- Compare updates to the baseline to understand where time was gained or lost.
Related terms
Questions people ask
What is float?
Float is how long a task can slip without delaying the project end date. Critical tasks have none.
Can there be more than one critical path?
Yes. Parallel chains with the same total duration are both critical.
Does the critical path change?
Yes, as progress and delays change relative task timing.
Sources and further reading
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