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Definition: CPM (Critical Path Method)
It was developed by DuPont in the year 1957. It is a project management technique used for scheduling the set of project activities.
To follow critical path method, following information is required:
Total length of the project and all the activities involved
Time required for individual activities
The nature and quantum of dependence between the activities.
The CPM will then help to identify those activities which are on the critical path. Any delay in performing the activity on the critical path will lead to a delay in completion of the project. Some leeway can be taken for those activities which are not on the critical path, i.e. they can be delayed or started late up to a given level.