Definition of Precedence Relationship in PMP

Precedence Relationship

Precedence Relationship is always assigned to activities based on the dependencies of each activity.

There are four recognized precedence relationships:

• Finish-to-Start (FS)
• Finish-to-Finish (FF)
• Start-to-Start (SS)
• Start-to-Finish (SF)

What is Lag?

• is a delay in the start of a successor activity.
• is determined by a dependency.

What is Lead?

• is implemented when you need to accelerate a successor activity in order to shorten the overall project schedule.
• will vary in length depending on the acceleration required by the amended schedule.