This study explored the effectiveness with which Catholic secondary schools served students from low-income families, with particular emphasis on the usefulness and results of tracking. Teams of researchers spent one full week in each of three Catholic secondary schools on the east coast gathering data through interviews with students, teachers, administrators, and parents; observing classrooms; and examining materials submitted by school administrators. The portrait of the tracking programs at the Catholic schools was not too different from that observed in public schools. Catholic schools had as many subject areas and ability grouped courses and were just as constrained in placement decisions. Catholic schools did not seem to avoid the racial differentiation endemic in tracking. Where the organizational differences emerged was in the curriculum and quality of instruction, and a challenging learning environment was prevalent in all levels of the Catholic school tracking programs. A two-page list of references and 14 tables summarizing research data conclude the document. (CB)