Professional societies and institutes have stressed the importance of a dialogue between scientists and the public over the past decades. Especially the life sciences include many highly relevant research topics pertaining not only to scientific progress but also to decision-making in society. Surprisingly, few educational researchers and…

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…