Public interest activities of 990 American Psychological Association (APA) members were surveyed using a 38-item public interest questionnaire. Activities are presented in terms of the percentage of psychologists performing them, the amount of time invested during a 12-month period, and the extent to which they were uncompensated. Results show every activity to have drawn at least some reports of participation, with frequencies ranging from 2% to 67% of the sample. Slightly more than one half of the activities are primarily uncompensated. As we define the term, 4% of the respondents say they did no public interest work during the past year. At the other extreme, 9% report doing public interest work on almost a full-time basis (between 1,000 and 2,000 hours a year). The median APA member reports spending nearly 300 hours a year on public interest activity. This survey is the first to provide a baseline measure of public interest activity and will help psychology to monitor and encourage such activity in the future. It does not answer the question of whether APA members spend "enough" time in public interest work. That is a value commitment we urge psychologists, individually and collectively, to reconsider in light of our findings.One of the significant developments in American society in the last decade has been the emergence of the public interest movement. Long identified with law, public interest groupings have appeared in a variety of other scientific and professional disciplines, including psychology. It is widely assumed by public interest advocates that members of these disciplines do not participate adequately in public interest activities. Thus, addressing the 1976 American Psychological Association (APA) meeting in Washington, D.C., Ralph Nader called on psychologists to develop a greater "public interest dimension" to their work ("Nader Chides Researchers," 1976).Nader's concern is reflected in several developments within the discipline. In 1974 an ad hoc Committee on Promoting Public Interest Activity (COPPIA) was established by the APA's Board of