Hi Tim. I just want to verify something that I read on a project management book regarding free slack. The book specifies that free slack can only happen on the last activity of a chain that feeds into the critical path. Is this true? The PMBOK (5th edition) says that free slack is "the amount of time that a schedule activity can be delayed without delaying the early start date of any successor or violating a schedule constraint", but it doesn't specify that it can only happen on the last activity on a chain that feeds into the critical path. That other project management book that I read is based on the 6th edition.