interdependencies among tasks may be defined using a task network. Tasks, sometimes called the project work breakdown tructure(WBS), are defined for the product as a whole or for individual functions.
Both PERT and CPM provide quantitative tools that allow you to(1) determine the critical path-the chain of tasks that determines the duration of the project,(2) establish " most likely" time estimates for individual tasks by applying statistical models, and(3) calculate "boundary times" that define a time "window" for a particular task.