The network diagramming technique that uses boxes to represent activities is called a PERT (Program Evaluation and Review Technique) chart. PERT charts are used to represent the sequence of tasks in a project, and each box in the chart represents a single activity. The arrows between the boxes represent the flow of the project and the dependencies between tasks.

Precedence diagram method

The precedence diagram method (PDM) is a tool for scheduling activities in one 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 tasksnon-critical tasks and time off
  • Shows the relationship of tasks to each other
  • Allows for what-if, worst-case, best-case, and most likely scenario

Key elements include determining ancestors and defining attributes such as

  • early start date..
  • late start date
  • early end date
  • late end date
  • duration
  • activity name
  • WBS reference

Day off/Float: Determines the duration of activity delay that the project can tolerate before the project is late. The difference between the earlier and later start time. i.e. Slack = Latest Start Date – First Start Day or Slack = Last End Time – First End Time.

Any activities that have a float of 0, they are in the critical path.

resolving the PDM, with: BS is an early start date. BM is a late start date. KS is an early end date. KM is a late finish date.

Different methods of precedence diagramming

External Links

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