New research from the Center for Collaborative Education finds that students in Boston's Pilot high schools outperform students from other non-exam Boston Public Schools on every standard measure of engagement and performance. This level of achievement holds for every racial, economic, and academic subgroup examined. Pilot high school students show better MCAS scores, higher attendance rates, higher promotion rates--and the four-year graduation rate for 2006 was more than 23 percentage points higher than the rate for BPS students, 75.7% as compared with 52.2% for BPS. ("BPS" in this report refers to non-Pilot, non-exam schools.) The study found that Pilot high schools reflect the BPS demographics in terms of race, income, and mainstream special needs students. The report also identifies some areas in which Pilot School demographics fall short of the goal of representing the student population of the Boston school district. Pilot high schools have proportionately fewer students designated as Limited English Proficient and fewer students with moderate to severe special needs. In addition, proportionately fewer students arrive with certain other warning signs of "risk," such as low grade 8 math MCAS scores and poor attendance records in eighth grade. It is not possible to isolate how much differences in populations, in addition to the Pilot features of schools, affected differences in performance outcomes. However, the news from the report is that Pilot high school students in every category--including students with risk factors--performed better than their counterparts in the Boston school district. The present study offers a review of Pilot high school student performance over the course of four years, looking at overall outcomes. It then parses the data to identify how different populations of students are being served by the Pilot Schools. Five appendices are included: (1) Pilot Schools/Horace Mann Network Vision, Mission, and Principles and Practices; (2) Pilot High School Information; (3) Group Sizes for Analyses; (4) Detailed Methods and Limitations; and (5) 2004-05 Subgroup Demographics by Pilot High School (in percent). (Contains 22 tables, 14 figures and 22 footnotes.) [Funding for this report was provided by Jessie B. Cox Foundation, Goldberg Foundation and Washington Mutual Foundation.]