Hi, the project finish date is almost 2 years delayed, which constraint shall I use in P3? The data date after I put the constrainst will be the project start date. When I use the mandatory constrainst, the total float will be zero for that activity while the successors has negative floats. When I use the late constrainsts, it has no negative floats. When I use the early constrainst, the applied activity has negative floats. So which one shall I use. I want to show the result of these constrainst to claim Extenstion of time. Can you elaborate the difference between them?