Logical Relationship

A logical relationship defines how one activity is tied in sequence to another activity or to a milestone, specifying the order and timing of work.

Key Points

  • Shows the sequencing link between two activities or between an activity and a milestone.
  • Common types include finish-to-start (FS), start-to-start (SS), finish-to-finish (FF), and start-to-finish (SF).
  • Leads and lags can be applied to adjust the timing of the relationship.
  • Used to build the network diagram and drive the project schedule logic.

Example

The team cannot start system testing until coding is completed (finish-to-start). Also, the "Regulatory Approval Granted" milestone must occur before construction mobilization can begin.

PMP Example Question

Which logical relationship best describes a situation where testing can only begin after development is complete?

  1. Finish-to-Start (FS)
  2. Start-to-Start (SS)
  3. Finish-to-Finish (FF)
  4. Start-to-Finish (SF)

Correct Answer: A — Finish-to-Start

Explanation: In a finish-to-start relationship, the successor (testing) cannot start until the predecessor (development) finishes.

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