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?
- Precedence relationship
- Resource leveling
- Milestone list
- Rolling wave planning
Correct Answer: A — Precedence relationship
Explanation: The link defines the dependency and order between two activities in the precedence diagramming method.
HKSM