Critical Path :
The critical path of a network gives the shortest time in which the whole project can be completed. It is the chain of activities with the longest duration times. There may be more than one critical path in a network and it is possible for the critical path to run through a dummy activity.
Activities on the critical path are known as critical activities.
An activity is said to be critical if a delay in its start will cause a delay in the completion date of the entire project. A none-critical activity is such that the time between its earliest start and its latest completion dates (as allowed by the project) is longer than its actual duration. In this case the non-critical activity is said to have a slack or float time.
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