A strong base of research is needed to guide investments in teacher professional development (PD). This article considers the status of research on PD and articulates a particular direction for future work. Little is known about whether PD can have a positive impact on achievement when a program is delivered across a range of typical settings and…

Explores issues in evaluating exemplary programs, including the measurement of the degree to which the program is exemplary or promising. Suggests that comparison (control) group analysis can mislead researchers about the effectiveness of a program and suggests the use of gain scores to identify exemplary programs. (SLD)

Education researchers, practitioners, and policymakers alike are committed to identifying interventions that teach students more effectively. Increased emphasis on evaluation and accountability has increased desire for sound evaluations of these interventions; and at the same time, school-level data have become increasingly available. This article…