"Talent Development High Schools" is a school reform model for restructuring large high schools with persistent attendance and discipline problems, poor student achievement, and high dropout rates. The model includes both structural and curriculum reforms. It calls for schools to reorganize into small "learning communities"--including ninth-grade academies for first-year students and career academies for students in upper grades--reduce student isolation and anonymity. It also emphasizes high academic standards and provides all students with a college preparatory academic sequence. One study of "Talent Development High Schools" met the What Works Clearinghouse (WWC) evidence standards with reservations. The quasi-experimental research design included multiple cohorts of entering ninth-grade students from 11 Philadelphia high schools--five "Talent Development High Schools" and six matched comparison schools. The WWC considers the extent of evidence for "Talent Development High Schools" to be small for progressing in school. No studies that met the WWC evidence standards with or without reservations addressed staying in school or completing school. "Talent Development High Schools" was found to have potentially positive effects on progressing in school. (Contains 9 footnotes.) [The following study is reviewed in this intervention report: Kemple, J., Herlihy, C., and Smith, T. (2005). Making progress toward graduation: Evidence from the Talent Development High School model. New York: MDRC.]