This higher concentration of under qualified or novice teachers in schools serving
disadvantaged students has a negative impact on student performance (Darling-Hammond,
2010), further diminishing their chances of success. Depending on how teachers’ careers are managed and on financial incentives, more able teachers often avoid teaching in those schools or leave once they have gained enough experience, resulting in very high levels of turnover in many cases18 (table 3.2) and concerns about the continuity of educational programmes in such schools (OECD, 2005).