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Activity-on-Node (AON)

A schedule network technique where each activity is drawn as a node (box) and dependencies are shown with connecting arrows (FS, SS, FF, SF). It is the standard, widely used form of the precedence diagramming method (PDM).

Key Points

  • Activities appear as nodes; arrows indicate the direction and type of dependency.
  • Supports four relationship types (FS, SS, FF, SF) and allows leads and lags.
  • Forms the basis for critical path analysis and schedule compression (crashing, fast-tracking).
  • Synonymous with the precedence diagramming method (PDM) used in most scheduling tools.

Example

In a software project, “Design UI” must finish before “Build Frontend” starts (FS). “Configure CI/CD” can begin two days after “Set Up Repositories” starts (SS with a 2-day lag). “System Test” cannot finish until “Integration” finishes (FF). This network is modeled using AON/PDM with boxes for each activity and arrows for the relationships.

PMP Example Question

A scheduler draws boxes for each task and connects them with arrows labeled FS and SS. Which technique is being used?

  1. Activity-on-Node (AON)
  2. Activity-on-Arrow (AOA)
  3. GERT network diagram
  4. Milestone chart

Correct Answer: A — Activity-on-Node network diagram (PDM)

Explanation: In AON, activities are nodes and arrows show precedence relationships (the PDM approach). AOA represents activities as arrows, not boxes.

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