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Project Management & Agile · Intermediate

Logical Relationship Types

The four dependency types between activities: finish-to-start, start-to-start, finish-to-finish, and start-to-finish.

Definition

FS: successor starts after predecessor finishes (most common). SS: successor starts after predecessor starts. FF: successor finishes after predecessor finishes. SF: successor finishes after predecessor starts (rare).

Example

Editing (successor) can finish only after writing (predecessor) finishes: FF.

Exam tip

SF is rarest; a classic example is a new guard shift must start before the old one can finish.

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