The UK research literature on the effects of deinstitutionalization, published between 1980 and 1994, was reviewed. The results from 71 publications arising from 46 studies indicated that smaller, community-based residential services were generally, though not inevitably, associated with: (1) increased user engagement in ongoing activities; (2) increased contact from care staff; (3) increased use of community facilities; (4) increases in adaptive behaviours; (5) reductions in observed challenging behaviour; (6) increased opportunities for choice; (7) increased contact with family and friends; (8) a better material standard of living; and (9) increased acceptance by the community. No differences were found with regard to reported challenging behaviour. In addition to these differences between institutions and community-based residential services, there were also large differences in service quality within community-based residential services, with some community-based services providing a quality of life s...