This study investigates the margin for interpretation that can rise due to uncertainties in the procedure for temporary constellations for cooperation. The study is a case study of qualitative nature and the empiric part has been collected with semi–structured interviews. The case consists of a constellation for cooperation and its decision process for a potential establishment of a dryport in the municipalities of Bjuv and Åstorp. The study shows that there are unclear points that have led to a margin for interpretation where the different actors are given the possibility to keep and develop their own interpretation of the problem area. This has in turn led to that the actors, that at the start of the constellation were doubtful to the project, have changed their view into a more positive one. Furthermore, the study shows that the voluntary participation can change over time and that this can happen within the so called margin for interpretation. The voluntariness can also be affected by different interdependencies in relation to the constellation for cooperation.