![]() ![]() When you create a model of a project schedule using the critical path method, it is deterministic. A project can have several paths that can become critical depending on the actual durations of the project activities. This determines the shortest time possible to complete the project any variability on the critical path directly affects the planned project schedule. This method determines which activities are on the “critical path” – the sequence of activities that add up to the longest overall project duration. ![]() It also calculates the earliest and latest that each activity can start and finish without delaying the project. The critical path method uses these values to calculate the longest path of planned activities that are required to complete the project. The technique for using this method is to construct a model of the project schedule using a list of all the project activities, the duration of each activity and the dependencies of each activity. Traditionally, project managers manage schedule risk by using the critical path method. Project managers need to use appropriate tools to manage the variability (or risk) in the project. Since projects contain many sources of variation, all three aspects are prone to not meeting targets. The three critical aspects of a running a successful project include project costs, project scope and project schedule.
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