Precedence diagram method

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. i.e. Slack = last start date - early start day or Slack = last finish time - early 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

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