There are several ways in which the quality of an education system can be improved. Whatever is done in terms of distributing new material or developing new curriculum, however, the quality of education that students receive will always be highly dependent on the quality of instruction that teachers provide. In other words educational effectiveness depends first and foremost on teachers effectiveness. The present booklet addresses the important issue of how teachers and the schools in which they work can be made increasingly effective. It summarizes a wealth of research results available on the subject in developed, but also developing countries. It also provides instruments for researchers, or those responsible for the planning of teaching in one country, who would like to study what really happens in the classrooms in which students receive their instruction.
