This study, started in August 1989, describes the acceptability of diaphragms as part of the daily routine of 194 women enrolled at five public health care centers in Osasco, (Greater São Paulo). Follow-up of the cohort was performed by semestral home interviews until August 1991. Our data indicate that the diaphragm can be a viable alternative within the public health care setting. Women, including those from low-income groups, are interested in new alternatives to currently available contraceptive practices. Nevertheless, the cumulative rate of continuity for use of the method was only 25.7% (39 women) after a period of 12 months. Only 37.1% of women opting for the diaphragm confirm its use during every act of sexual intercourse. Most of the women (72.7%) only learned about diaphragms during the process of choosing a contraceptive method. The main reasons for discontinued use were partners' complaints, discomfort, and difficulty in handling. The findings point to the need for reformulating family planning activities to provide greater support for women, introduce initiatives to enhance male participation, and promote on-going training of health professionals with regard to the management of the method and support for its users.