While updating your schedule you may sometimes find that out-of-sequence work has been performed. When out-of-sequence logic occurs activities can move around unexpectedly and figuring out why activities are where they are can be extremely difficult. With Retained Logic Relationships the schedule logic becomes transparent. The purple relationship lines highlight where out-of-sequence logic is and show what was driving an activity and what is now driving an activity. With Phoenix Project Manager finding what drives your Construction CPM Schedule is easy.