Borko et Putnam 1995) Concerning the impact of teacher education on student outcomes, it is possible to subdivide this issue into three sub-questions. What is the impact of teacher education on student outcomes? This empirical study is based on data from 50 State-surveys of policies, taken from the 1990-1993 Schools and Staffing survey and the National Assessment of Educational Progress (NAEP). It shows evidence that the policies used in the different American States to promote teacher quality (especially those regarding teacher education requirement and certification, as well as continuing training) can be positively related to better student achievements.