In simplest terms, we compare average student achievement gains in the same school under different principals. (educationnext.org)
This review of research finds that teaching experience is, on average, positively associated with student achievement gains throughout a teacher's career, especially in collaborative school environments. (learningpolicyinstitute.org)
Teachers who more effectively demonstrated the types of practices emphasized in any given system had greater student achievement gains than other teachers. (hechingerreport.org)