Project Achieve Transition Services (PATS) is a four-year high school attendance improvement, dropout prevention project which targets late-entry students consisting primarily of immigrants, transfers, and long-term absentees. The program uses a case management approach to provide support services, instructional enhancements, and family outreach to meet these students' needs. The evaluation takes the form of a case study of the program as it is being implemented in Martin Luther King, Jr. High School in Manhattan (New York), as well as assessment of quantitative outcomes in all seven participating schools. Attendance data for late-entry students was found to be only slightly lower than the attendance rates of the regular school population in all seven schools. Findings suggest that the program has an effect on long-term absentees who constitute an important segment of the late-entry population. Although credit accumulation data showed that few students met the program's objectives in this area, the number of credits earned by late-entry students in this program compare favorably to the overall credit accumulation of other non-participating students. The findings suggest that the program is having a positive impact on the majority of the students for whom it was established. (BF)