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. It is also called the activity-on-node (AON) method.
Critical tasks, noncritical tasks, and slack time
Shows the relationship of the tasks to each other
Allows for what-if, worst-case, best-case and most likely scenario
Key elements include determining predecessors and defining attributes such as
early start date
late start date
early finish date
late finish date
duration
activity name
WBS reference
Slack/Float: 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.[1]: 502 [2]: 183 i.e. Slack = latest start date - earliest start day or Slack = latest finish time - earliest finish time.
Any activities which have a slack of 0, they are on the critical path.
solving the PDM, with: BS is an early start date. BM is a late start date. KS is an early finish date. KM is a late finish date.
Different Precedence diagram Methods
Arrow diagramming method
Project network
Critical-path method
Gantt chart
Program evaluation and review technique
^Kerzner 2009. sfn error: no target: CITEREFKerzner2009 (help)
^Sanghera 2019.
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