The purpose of this study is to create a deeper understanding of why collaboration projects emerge. The background of the study is the fact that collaboration projects are increasing in the society and being impelemented in the welfare. This is the basis of the researched question, why does Lund municipality tend to start collaboration projects within the welfare for young people? The study is conducted as a case study on a chosen project, ComUng. ComUng is a collaboration project that works with youths who are at risk of alienation. Interviews, text analysis and a web survey have been used as methods to find out why collaboration projects emerge. The results have been analyzed using an analysis tool based on research by DiMaggio and Powell (1983), which attempts to identify why organizations become increasingly alike. This phenomenon is called institutional isomorphism and is analyzed using three mechanisms: coercive isomorphism, mimetic isomorphism and normative isomorphism. The result of the study is that primarily two out of the three mechanisms have influenced the formation of ComUng. These are coercive isomorphism and normative isomorphism. The main difficulty I experienced during the study is the low frequency of answers to the web survey. Despite of this I believe the case study of ComUng can contribute with knowledge about why collaboration projects are formed. The conclusion is that a combination of a mindset shared by the personel and the resource possibilities from an external actor, in this case the European Social Fund, are the primary factors that have enabled this project. Previous research has tended to focus on the external resource. However, I believe that the personel and their opinion on how welfare can be operated are equally important.