CPM (Critical Path Method) tool considers these two project activities or tasks.
1. Dependent tasks: These project activities depend on other tasks before they can be completed. They are carried out sequentially because a dependent task cannot be completed when another task has not yet been finished.
2. Concurrent tasks: These are independent tasks that can be done with other activities simultaneously. These activities do not depend on other tasks to be completed before they can be finished.
Thus, this is why some project activities can be carried out simultaneously while other tasks or activities must be completed sequentially.
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