Precedence Relationship

An ordering link between two activities in the precedence diagramming method that shows how one activity depends on another.

Key Points

  • Represents how activities are connected in PDM using FS, SS, FF, or SF links.
  • Controls the sequence of work and may include leads or lags.
  • Displayed as connectors between activity nodes in a schedule network diagram.
  • Choosing the wrong relationship can distort timelines and create infeasible schedules.

Example

In a software project, "Complete design" must finish before "Start development" can begin (Finish-to-Start with zero lag). "Begin system testing" may start two days after "Start integration" (Start-to-Start with a 2-day lag). These links are precedence relationships in the PDM network.

PMP Example Question

In a schedule network built with PDM, the team links "Pour concrete" so it cannot start until "Place rebar" is complete. What is this link called?

  1. Precedence relationship
  2. Resource leveling
  3. Milestone list
  4. Rolling wave planning

Correct Answer: A — Precedence relationship

Explanation: The link defines the dependency and order between two activities in the precedence diagramming method.

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