Focusing of what´s best for the child has been a keyword in social work for a long time. That seems obvious for many people, but sometimes it lacks in the care of the children and the child may be taken in to care. The purpose was to find circumstances of success that can contribute to a successful placement of the child according to social workers and foster families. In which way does the cooperation between social worker, foster family and the origin family affect the placement? The study is based upon a qualitative method in form of interviews intending to get the respondents own knowledge and experience of foster care. Matching the child’s needs to the foster families resources were important according to the respondents. Participation of all parties concerned appeared as a circumstance of success to make the cooperation work.