Precedence Diagramming Method (PDM)- Network diagram with task dependencies.

Definition

The Precedence Diagramming Method (PDM) is a visual project scheduling tool that illustrates the sequence of activities in a project. It helps in understanding dependencies between tasks.

Types of Task Dependencies in PDM

  1. Finish-to-Start (FS) – Task B starts only after Task A finishes.
  2. Start-to-Start (SS) – Task B starts when Task A starts.
  3. Finish-to-Finish (FF) – Task B finishes only after Task A finishes.
  4. Start-to-Finish (SF) – Task B finishes only after Task A starts (rare).

Benefits of PDM

✔ Provides a clear roadmap for project execution.
✔ Helps in identifying critical paths for scheduling.
✔ Ensures team members understand task relationships.

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