Although caffeine is seemingly harmless in ordinary daily intake, there has been increasing concern about the possible side effects of habitual caffeine ingestion. The excessive daily ingestion of caffeine in the form of coffee, soda pop, tea, and various medications may lead to a chronic disorder known as caffeinism. This study tested the efficacy of behavioral management of excessive caffeine consumption. Primary treatment components included changing criterion, self-monitoring, didactic information and public announcement, contingency contracting and response cost, incompatible responses, and alternative stimulation. It was expected that the three subjects would increase self-management skills and maintain appropriate caffeine consumption following treatment. Treatment and follow-up results substantiated these expectations. Subjects' daily caffeine consumption decreased from over 900 milligrams during baseline (the equivalent of over eight cups of coffee) to less than 300 milligrams during maintenance. The results appear to support the suggested effectiveness of behavioral interventions in the treatment of excessive caffeine consumption. Figures and tables are provided. (NB)