A coming client has initially some needs, which he works on before considering them as a construction project. When he has worked on and thought appropriately about his need, he suddenly reaches a state where he considers his needs as an idea for a building project. If the users to come extend are known, they can be co-players in this adaption process. After this, the actual building process begins with the brief phase. The client’s needs should be transformed into building requirements in the briefing process. This implies determination of both product values and process values (see section 1.1.2 in this article). It should, however, he pointed out that this investigation involves primarily the determination of product values. Hoe to determine process values is a subject for other research. In the brief phase the client, user and the project team participate. To which degree the project team participates, depends on which tender mode the client chooses. The end product of the brief phase is a well-worker set of requirements.