This paper describes the relationships of selected dimensions of nurse-client interaction in county health department family planning clinics to the subsequent contraceptive use of the clinic's unmarried teenage clients. The subjects for the study are the clients and professional staff of 78 clinics: 2,900 eligible clients making their first contraceptive visit and 338 clinic staff nurses. Results of interviews demonstrate that client and staff expectations and interactions are significant predictors of adherence to a contraceptive regimen; under circumstances where clients anticipate, and staff employ, authoritative guidance in helping the clients to select a contraceptive method, clinic mean levels of contraceptive use are substantially increased. Overall, 40 per cent of clinic variation in contraceptive compliance is explained by the interaction dimensions and other aspects of clinic organization addressed in this paper. Implications of these results for the structuring of family planning clinic programs directed toward teenage women are briefly considered.