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…

Differences in reading comprehension were examined in students with disabilities after use of three reader modification types. Participants (n=10) conveniently selected from two school districts were students grades three through eight reading on a third grade level that received a reader as a modification in their Individualized Education…