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Predecessor Activity

A task that must occur before another, dependent task in the project schedule.

Key Points

  • Defines the logical order of tasks and establishes dependencies between activities.
  • Can be linked with different relationship types (FS, SS, FF, SF) along with leads or lags.
  • An activity may have multiple predecessors, a single predecessor, or none at project start.
  • Predecessor and successor relationships influence the critical path and schedule flexibility.

Example

In a building project, "Complete foundation" must finish before "Start framing" can begin. "Complete foundation" is the predecessor activity; "Start framing" is its successor.

PMP Example Question

Which statement best describes a predecessor activity?

  1. A task that starts only after its successor finishes.
  2. A task that must occur before a dependent task in the schedule.
  3. A task that is not linked to any other activity.
  4. A task that represents the longest path through the schedule network.

Correct Answer: B — a task that must occur before a dependent task

Explanation: A predecessor activity is one that logically comes before another activity that depends on it.

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