This book develops qualification standards in the field of teacher training in mathematics and brings together best practice examples from all areas of the work of the German Center for Teacher Education in Mathematics (DZLM), the central point of contact for teacher training in mathematics. It provides detailed information about measures, their objectives, structure, and outcomes. The target audience of the book includes subject advisors and so-called multipliers, i.e., individuals who provide professional and didactic advice, training, and further education for teachers, as well as those responsible for training in state institutes and school authorities, and subject didacticians.