The topic of this paper is psychiatric rehabilitation. Clinical researchers study outcomes to determine treatment effectiveness. Health care payers and Behavioral Managed Care Organizations (BMCOs) are interested in outcome research in order to establish an accountable basis for making decisions about resource allocation. (Wiens, 1994, p. 46) The general public has also become more educated about treatment options and they want to see evidence that treatment is working and is appropriate for their individual circumstances. In addition, large companies want to see evidence that treatments for psychiatric and substance abuse problems work. In short, there are a lot of people interested in knowing which therapy works and why.