This digest examines research on indicators of teacher quality. While research on the value of a teacher's advanced degree is mixed, all studies suggest that teachers with degrees in subjects different from the subjects they teach have little impact on students. There is no strong consensus about the value of pedagogical preparation for teachers,…

This addendum addresses questions of interest to state education policy makers, also elaborating on questions posed in the original work. Issues examined include: the extent to which subject knowledge contributes to teacher effectiveness; the extent to which knowledge of pedagogical theory, learning theory, or child development contribute…