Numerous intertwined decisions have to be made in early design processes. One issue is that they involve many actors, meaning that many relationships exist between these actors. This paper aims at facilitating their collaborative decision-making process by grouping actors according to the relationships they have due to their assignment to decisions and to interdependencies between these decisions. The Decision-Decision MDM is introduced and clusters are proposed with different configurations in order to provide decision-makers with a temporary and complementary organization designed for making simultaneously heterogeneous and intertwined decisions.