Using data from economics and history courses taught across multiple semesters, the authors show that a triweekly meeting frequency improves student performance relative to a biweekly meeting frequency. There is evidence that this effect operates through two channels. First, there is an indirect effect that operates through attendance. While…

This report is the fourth in a series of follow-up analyses of nine longitudinal studies addressing the costs and effectiveness of alternative types of early intervention for children with disabilities. An introduction provides an historical perspective and conceptual framework for the studies, including common study elements and how research…