Relationships Types in Primavera P6
1. Finish-to-Start (FS): This is the most common type of relationship where one activity cannot start until another associated activity has finished. An obvious example is that installation cannot start until demolition is complete.
2. Start-to-Start (SS): This is a relationship where one activity cannot start until another activity has begun. An example is that demolition cannot proceed until the safety plan has commenced.
3. Finish-to-Finish (FF): In this relationship one activity cannot finish until another related activity has finished. A possible example from the research industry is that documentation cannot complete until experimental testing described by that documentation has finished.
4. Start-to-Finish (SF): In this not so common relationship one activity cannot finish until another activity has begun. An example is the use of a generator that cannot cease until the power is activated.