Over the last several years, social science research on educational success has been coalescing around one indisputable fact. If you control for socio-economic factors, the most important influence on student success is the quality of the teacher.
Recently, a friend of mine, who is a vice-principal at a middle school in downtown Toronto, mentioned that although a majority of new teachers they hire every year succeed in the classroom, a significant number do not.
Part of the problem, apparently, is the interview process.
A blog run by the Laurier Institute for the Study of Public Opinion and Policy.