PERT, for Program Evaluation and Review Technique, is a project management method using directed graphs.

• Nodes represent events, milestones, or time points.

• Arcs represent activities, which take time and resources. Each arc is labeled with the amount of time it takes.

• A node has the maximum time of its incoming arcs.

• An activity cannot start before the time of its preceding event.

• The critical path is the longest path from start to finish.

• The slack is the amount of extra time available to an activity before it would become part of the critical path.

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