A study explored the effects of participation in two kinds of volunteer activities--community service and child care--on adolescents' attitudes toward social and personal responsibility skill development and knowledge acquisition. It was part of an evaluation of the New York State 4-H Youth Volunteers Program. Written questionnaires, interviews with 73 participants, and testimony from 11 adult supervisors were used to document such effects. Results showed that girls and community service project participants gained more positive attitudes than did boys or child care volunteers. Ninety percent of the participants indicated the likelihood of continued volunteer work; nearly all volunteers reported gains in skills and knowledge. Adults involved in the program saw adolescents becoming more confident of their abilities, learning to make decisions and work with children, and gaining in other ways that varied according to participants' individual needs and experiences. (YLB)