Long-stay psychiatric patients discharged to two group homes from Friern Hospital were studied 1 year and 5 years after discharge. A much greater cohesiveness of social relationships was noted in the smaller home at both time points, whereas in the larger home residents had failed to develop friendships and intimacy within their social group. A number of hypotheses were explored to explain this difference. None of the factors investigated provided an explanation, including the mental state of the patients prior to discharge, their problems of social behaviour, the size of the group homes, whether they were staffed or unstaffed, and the patients' age. However, the development of friendships and intimacy over a 5-year period was strongly determined by the quality of the patients' social networks while in hospital. Consequently, when selecting groups of patients to share homes in the community, it is deemed advisable to form groups that fully reflect the range and diversity of their social networks.