Addiction Response Crumlin (ARC) was established in 1996 as a response to the problem of drug use in the Crumlin area. The main purpose of this report is to describe the work of ARC and evaluate its impact. The report reviews the national policy on drug treatment services, and provides a comparative analysis of the population in Crumlin with Dublin City and Ireland. Also contained are the results of a survey of 91 clients out of a total of 100 whom used ARC in December 1997 and focus group discussions with current clients and staff. The core finding of this evaluation shows ARC is having a decisively positive impact on the lives of clients and is meeting a genuine need in the community. It is effective in stabilising drug users and helping them to progress to a drug free life. These outcomes indicate ARC is providing an effective service and is an excellent example of partnership between the health board and the community.