Studied the impact of ability grouping on attainment in a cohort of year-9 students in 45 mixed secondary schools in England representing a variety of grouping practices. In mathematics, students at higher levels by year 6 make more progress in sets, but those in lower levels make more progress in mixed ability classes. Discusses educational…

Describes an application of multilevel modeling to repeated measures as part of an evaluation of Reading Recovery in 22 schools in England and multivariate models are applied to the within and between school aspects of the design. Results show Reading Recovery to be effective in the short term, but not the long term. (SLD)

Describes ways of analyzing different kinds of designs using multilevel models, and considers practical issues such as the method used to allocate interventions, integrity of delivery, and cost, and how these interact with more technical issues of model specification. Two recent British intervention studies illustrate these practical issues. (SLD)

Examines the between-teacher differences in students' mathematics progress in two studies in London (England), one involving 776 Year 1 students and the other involving 22 schools and 28 teachers. The more of the mathematics curriculum teachers covered, the greater the progress made by students. (SLD)