As a result of the authors' experience in conducting an evaluation of the community support system (CSS) program in New York State, they have identified five reasons for focusing on quality of life (QOL) as a desired outcome for programs for the chronically ill. These reasons are presented and problems in QOL evaluative research are discussed. Psychological indicators are distinguished from social indicators of QOL, and two methods of operationalizing perceived QOL, the psychological well-being and life domains methods, are examined. A conceptual model is presented and the results of an exploratory study of the QOL of 118 chronic psychiatric patients receiving CSS services are presented.