Network Logic

The complete set of dependency relationships that link activities within a project schedule network diagram.

Key Points

  • Represents all precedence ties among activities in the network diagram.
  • Includes relationship types (FS, SS, FF, SF) plus any leads and lags.
  • Drives sequencing, critical path, and total/free float calculations.
  • Covers mandatory, discretionary, and external dependencies and must be kept current as the schedule evolves.

Example

In a software release project: A: Define requirements -> B: Design (FS); B: Design -> C: Develop (FS with 2-day lead to start early); C: Develop -> D: Test (SS with 3-day lag); D: Test -> E: Deploy (FF). Together, these ties form the project's network logic.

PMP Example Question

Which term describes the full set of dependency relationships connecting activities in a project's schedule network diagram?

  1. Work Breakdown Structure
  2. Network Logic
  3. Resource Histogram
  4. Milestone List

Correct Answer: B — Network logic (the dependency ties among activities)

Explanation: Network logic is the collection of all activity dependencies in the schedule network diagram; the other options do not represent precedence relationships.

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