The initiatives respond to the concern that disadvantaged students may be taught by less effective teachers and that this could contribute to the achievement gap between disadvantaged students and other students. (edimpactlab.com)
Many were replaced by a parade of less effective teachers, including many short - term substitutes. (articles.latimes.com)
The evidence at first seems contradictory, as the quality of instruction appears to decline following turnover despite the fact that most work shows higher attrition for less effective teachers. (caldercenter.org)