A project is a long story that is build up over time by ideas, decisions, resolutions and sometimes by a construction. To keep the story clear, we are constantly looking for these decisions to be bound to the project as much as they compose it. The word « bound », that is not the same than « linked », means a determined and natural link between things. It is very hard to find evidence in architectural decisions. What the project wants ? What it needs ? But also what opportunity exists in any question it faces ? Bound is constantly what we look for.