Category: Contracts & management
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
The critical path is the longest chain of activities in the programme, which sets the finish date. Any delay to an activity on it delays the whole project.
Why it matters on a project
Knowing it tells management where to put resources and attention, and it is the basis of any time claim.
Worked example
Two paths: A (10 days) then B (15) then D (5) = 30 days; A then C (8) then D = 23 days. The critical path is A-B-D and activity C has 7 days of float.
Common mistake
Giving every activity equal attention and letting a small critical one slip unnoticed.
Frequently asked questions
What is total float?
How long an activity can slip without delaying completion; it is zero on critical activities.
Can the critical path change?
Yes; as progress and delays occur another path can become the longest, so it is checked at each update.
Related terms
- Baseline programmeThe programme approved at project start against which progress is measured.
- Extension of time (EOT)The contractor’s entitlement to additional time for delay not of its making, subject to timely notice.
- Delay damages (liquidated damages)An agreed sum deducted per day of delay after the contractual completion date, capped in the contract.
- Method statementA step-by-step description of how an activity will be carried out safely and to specification.
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