The ultimate goals of providing health records to patients are to improve continuity of care, to improve patient understanding of instructions, and to encourage patients to take a more active role in maintaining their health. In the current study, four types of patient-carried health records were evaluated in a hospital-based outpatient service to determine whether records would be accepted and used, to estimate the cost of the process, and to obtain patient and provider reactions. Records were provided at moderate cost and the primary determinants in record acceptance and use were physicians' support of the process, the type of record, and the employment status of the patient. A small record which could be carried in a wallet seemed suited to most patients; other more elaborate participatory records appeared to have benefits for selected patients. More extensive use of participatory records appears to require changes in the way health care would be delivered.