There has recently been an expansion of paraprofessional staff involved in
the provision of care for the severely mentally ill. In this paper we shall
evaluate the effects of a community support worker (CSW) service in South
London. A sample of patients with severe mental illness receiving the servi
ce was assessed over a 6-month period in order to examine the effects of co
ntinuing use of CSWs on outcomes, service use and costs. During the study p
eriod there were improvements in outcome reflecting service satisfaction, n
eeds, quality of life and social behaviour. Whilst provision of the CSW ser
vice did not lead to extra total service costs, service use and cost data s
uggest that CSWs are associated with the substitution of in-patient use by
community-based services.