The aim of this study was to analyse the experiences of social workers in addiction unit have of collaborative work with the children's unit on the issue of children in families with alcohol abuse. The method used in this study was a qualitative method and the empirical material has been collected through semi-structured interviews with five social workers in addiction unit in southern Sweden. The result of this study was analysed by framework three different theories: collaboration theory, system theory and organization theory. The study also builds on previous research that treated the same area. The results of this study show that more knowledge about collaborative work is needed. It also appears that there are various factors that hamper the collaborative effort between addiction unit and the children's unit regarding children of alcohol-abusing parents. This concerns for example, perspective differences, legislation and its constraints as well as budget and funding of joint efforts.