The pattern notion defines techniques allowing the existing knowledge reuse. A pattern solves a specific problem of a software system life cycle. The knowledge encapsulated in these patterns is generally stored in classic library repositories that quickly become overcrowded. As a result, [DEN 01B] proposes the use of process maps in order to help the method engineer to sort and select them. But the completeness of the maps are a very important problem that has to be solved in order to offer a useful guidance to the method engineer. This paper deals with this problem with a pattern construction technique guiding engineers when creating the maps.