This paper provides practical guidance for researchers who are designing and analyzing studies that randomize schools--which comprise three levels of clustering (students in classrooms in schools)--to measure intervention effects on student academic outcomes when information on the middle level (classrooms) is missing. This situation arises…

The history of strategies research during the past quarter century has been a story of significant conceptualizations and reconceptualizations regarding the nature, development, and teaching of cognitive and metacognitive strategies. Theoretical models, empirical research, and discussions contributed by Michael Pressley have been central to…