Multisite trials, in which individuals are randomly assigned to alternative treatment arms within sites, offer an excellent opportunity to estimate the cross-site average effect of treatment assignment (intent to treat or ITT) "and" the amount by which this impact varies across sites. Although both of these statistics are substantively…

This article reports key findings from a 2-1/2-year mixed methodological study of professional learning communities, the first of its kind in England. In particular, the concept of effectiveness is explored as it relates to professional learning communities. We describe three ways in which effectiveness can be construed, arguing that any…

The authors analyzed the domain specificity of emotions and focused on experiences of enjoyment, anxiety, and boredom in the domains of mathematics, Latin, German, and English. On the basis of assumptions in R. Pekrun's (2000; in press) control-value theory and findings of pilot studies, the authors hypothesized the existence of a largely…