Winters' work is considered a classic in mathematics education and is continuously used in teacher training at all school levels. It is no surprise that this new edition has been enthusiastically received by numerous knowledgeable voices from both theory and practice. Thanks to the consistent incorporation of historical contexts and well-developed examples, the reading is comprehensive and is highly recommended for all those interested in mathematics. "For a subject didactics in which practice-oriented theory and theory-guided practice are organically connected through the essence of mathematics, this impressive work sets standards." Prof. Dr. Dr. h.c. Erich Ch. Wittmann.