Since the work of the International Commission for Mathematics Instruction (ICMI) at the beginning of this century, nobody can challenge the fact that scientific work has been done in the field of teaching and learning mathe- matics. This research work has been carried out by mathematicians, psy- chologists, educational scientists, mathematics teacher trainers, and mathe- matics teachers themselves. However, scientific communication on these is- sues long remained in its infancy, particularly on an international level; much work was done in isolation; and it was rare to find people who con- sidered that they belonged to a separate scientific discipline, independent from mathematics or educational science.
Didactics of Mathematics as a Scientific Discipline. (2002). Didactics of Mathematics as a Scientific Discipline. Kluwer Academic Publishers. https://doi.org/10.1007/0-306-47204-x