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
- 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.
Different methods of precedence diagramming
- arrow layout method
- project network
- critical path method
- gantt chart
- Program evaluation and review technique
- Precedence Diagram Method at Better Projects
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1. Activity on Node
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5. Network Diagram
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7. Activity Sequencing
8. Project Management
9. Task Duration
10. Logical Relationships
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