Internal Teacher Turnover in Urban Middle School Reform

The literature on teacher turnover has traditionally focused on teachers whose destinations are external to the school (be it another school, district or state, or profession). In this article I examine internal turnover that takes place among teachers who remain at their school but change their subject assignments. I analyze the levels, causes, and impacts on school reform of internal turnover within the science faculties at three urban middle schools during 4 years of a whole-school reform program. Major findings include the following: (a) Internal turnover levels are high, higher than external turnover; (b) subject assignments made without regard to both teachers' subject interests and stability of assignments appear to be the primary causes of internal turnover; (c) district policies allowing elementary-certified teachers to teach any subject foster internal turnover; and (d) internal turnover has serious detrimental impacts on school reform. I identify district and school-level policy options to reduce the level of internal turnover to support reform.