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It can be understood as representing the time, effort, and resources required to move from one event to another. A PERT activity cannot be performed until the predecessor event has occurred. PERT sub-activity: a PERT activity can be further decomposed into a set of sub-activities. For example, activity A1 can be decomposed into A1.1, A1.2 and A1.3.
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In probability and statistics, the PERT distributions are a family of continuous probability distributions defined by the minimum (a), most likely (b) and maximum (c) values that a variable can take. It is a transformation of the four-parameter beta distribution with an additional assumption that its expected value is
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X-Pert is geared to producing critical path method and PERT schedules for major, long-term projects (in one case [1] a duration now approaching 40 years).. Developed by users and contributors to the ICL 1900 PERT mainframe package, X-Pert is one of the few packages still fully supporting the activity on arrow project network process.
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The precedence diagram method (PDM) is a tool for scheduling activities in a project plan.It is a method of constructing a project schedule network diagram that uses boxes, referred to as nodes, to represent activities and connects them with arrows that show the dependencies.