ABSTRACT
The three chapters included in this section link the described practices for improving the quality of teachers and teaching to two current strands of the international debate on mathematics education, namely the debate on the professional development of teachers and the debate on effective mathematics teaching. Although these two strands are quite distinct, the following chapters manage to combine these two strands, i.e. that the improvement of teaching quality takes place through the professional development of teachers. The following aspects and measures are proposed.
