If everyone sticks to the arrangements that are made, does everything in the proper sequence, and in accordance with the agreed and well-considered planning, success is guaranteed. In most cases, there are several ways of taking up a matter. But if you jointly agree on a specific way to go forward, you cannot deviate from it at a later stage. As a matter of fact, a contract serves the same purpose as a construction drawing. It is like a railway timetable, enabling all parties involved to see at all times what to do under specific circumstances - and not to check what should have been done in retrospect after things have already gone wrong.