To evaluate the effectiveness and efficacy of both the interventionand administrative components of a weight control program, 37 obesesubjects participated in 10 or 12 week treatment programs based onnutrition, exercise, and behavior modification. According to establishedcompliance criteria, 18 of the 35 women subjects completed treatmentand were selected for investigation. Evaluation of the interventionrevealed a mean loss of body weight of 9.7 pounds f 6.4 s. d. , adecrease in percentage of body fat of 4.7% f 3.5 s.d., and an increasein knowledge of weight control principles. A paired t-test determinedthat all changes were significant (p~0.01). Follow-up 5 months posttreatmentrevealed a decrease of weight by 10.0 pounds f 7.9 s.d. andpercent body fat by 4.4% f 4.9 s.d. between pre-treatment and follow-upmeasurements (p4 0.01). Comparison between post-treatment and follow-updata demonstrated no significant differences. The following administrativecomponents were evaluated: 1.) personnel and setting, 2.) cost effectiveness,3.) client satisfaction, and 4.) marketing and promotion.Results of this investigation illustrated that a behavioral approach toweight control, utilizing nutrition and exercise interventions iseffective in reducing body weight to established goals, decreasing bodyfat, and improving knowledge of weight control principles. Further thisprogram appears to be a satisfactory modality for administering weightreduction therapy.