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The duration of the critical path determines the duration of the entire project. Any delay of a terminal element on the critical path directly impacts the planned project completion date (i.e. there is no slack on the critical path).

A project can have several, parallel critical paths. An additional parallel path through the network with the total durations just shorter than the critical path is called a sub-critical path.

Originally, the critical path method considered only logical dependencies among terminal elements. A related concept is the critical chain, which adds resource dependencies.

The critical path method was invented by the DuPont corporation.

See also

• List of project management topics
• PERT
• Project
• Project management
• Project planning
• Work breakdown structure

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