A graphical project management technique that shows the time taken by each component of a project, and the total time required for its completion. The program evaluation and review technique (PERT) breaks down the project into events and activities, and lays down their proper sequence, relationships, and duration in the form of a network. Lines connecting the events are called paths, and the longest path resulting from connecting all events is called the critical path. The length (duration) of the critical path is the duration of the project, and any delay occurring along it delays the whole project.

Tip excerpted from: The Professional's Guide to Maintenance and Reliability Terminology by Ramesh Gulati, Jerry Kahn and Robert Baldwin