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Precedence diagram method
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<p>The precedence diagram method (PDM) is a tool for <a href="/facts/Schedule_(project_management)/h9nqwer4">scheduling</a> activities in a <a href="/facts/Project_plan/0jCeIAvx">project plan</a>. 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 <a href="/facts/Dependency_(project_management)/y9qKg1Cb">dependencies</a>. It is also called the activity-on-node (AON) method. </p> <ul><li>Critical <a href="/facts/Task_(project_management)/2ufY8v5B">tasks</a>, noncritical tasks, and slack time</li> <li>Shows the relationship of the tasks to each other</li> <li>Allows for what-if, worst-case, best-case and most likely scenario</li></ul> <p>Key elements include determining predecessors and defining attributes such as </p> <ul><li>early start date</li> <li>late start date</li> <li>early finish date</li> <li>late finish date</li> <li>duration</li> <li>activity name</li> <li><a href="/facts/Work_breakdown_structure/JNyogLTk">WBS</a> reference</li></ul> <p>Slack/<a href="/facts/Float_(project_management)/jTjhvEbq">Float</a>: Determines the duration of activity delay that the project can tolerate before the project comes in late. The difference between the earliest and the latest start time.: 502 : 183 i.e. Slack = latest start date - earliest start day or Slack = latest finish time - earliest finish time. </p><p>Any activities which have a slack of 0, they are on the <a href="/facts/Critical_path_method/cl8LtYqY">critical path</a>. </p> <p>Different Precedence diagram Methods </p> <ul><li><a href="/facts/Arrow_diagramming_method/8KDkuz2a">Arrow diagramming method</a></li> <li><a href="/facts/Project_network/nFlT56uG">Project network</a></li> <li><a href="/facts/Critical-path_method/cl8LtYqY">Critical-path method</a></li> <li><a href="/facts/Gantt_chart/HooQgCvs">Gantt chart</a></li> <li><a href="/facts/Program_evaluation_and_review_technique/TVTWehCE">Program evaluation and review technique</a></li></ul>