The six chapters of this theme issue consider three trends in educational effectiveness research: (1) integration of effectiveness phenomena at different levels, (2) a more model-driven approach than in the past, and (3) increased complexity of analysis tools and techniques to suit the new emphasis on process. (SLD)

Data based instruction reflects the teachers implementation of a carefully planned system of instruction for a selected learner. The purpose is to provide documentation of the effect of instruction implemented for learner(s) with special needs; evaluate the effect of using specific instructional organization and delivery systems; perform an…

Six papers discuss the Louisiana School Effectiveness and Assistance Pilot (SEAP) program, an ongoing 3-year research project associated with a legislatively mandated school and district accountability program. In three phases, the project joins school indicators, school effectiveness, and school improvement initiatives. The following papers are…

Ten papers are presented that discuss new developments in school effectiveness research from an international perspective. Three papers discuss factors that determine school effectiveness, and one paper considers the analysis of data. The remainder of the papers report on empirical investigations of school effectiveness. (SLD)