An attempt to determine the nature or scope of volunteer activity within the rehabilitation facilities of this country is described. The study involved the following "first-time" procedures: (1) compiling a comprehensive list of rehabilitation facilities in the United States; (2) designing a single questionnaire for distribution to an extremely diverse population of facilities; (3) designing a series of questions for probing attitudes about volunteer participation; and (4) developing a scale to classify the organization development of volunteer programs. This report presents findings based on responses of Executive Directors/ Administrators, Auxiliary Presidents, Volunteer Coordinators, and Individual Volunteers. Other discussions in the report concern Developmental Classification of Volunteer Programs, Potential for Future Research, Implications of the Study, and Research Questionnaire. The text is illustrated with 75 tables. (DB)