Dependency

There are four standard types of dependencies:

1. Finish to start (FS)
   • A FS B = B can’t start before A is finished, or in another words Activity A must be completed before Activity B can begin.^[2]
   • 
   • (Foundations dug) FS (Concrete poured)
2. Finish to finish (FF)
   • A FF B = B can’t finish before A is finished or in another words Activity A must be complete before Activity B can finish.^[2]
   • 
   • (Last chapter written) FF (Entire book written)
3. Start to start (SS).
   • A SS B = B can’t start before A starts or in another words Activity B can start after Activity A has started.^[2]
   • 
   • (Project work started) SS (Project management activities started)
4. Start to finish (SF)
   • A SF B = B can’t finish before A starts
   • 
   • (New shift started) SF (Previous shift finished)