This book offers students, particularly during practical phases and internships, teacher trainees, and prospective teachers during their training, as well as practicing educators looking for new ideas for their daily teaching, a variety of innovative yet practical suggestions for planning and implementing their mathematics lessons in secondary education – including a wealth of teaching materials. The theoretical foundations of the principles of contemporary mathematics instruction, as well as planning and designing lessons, are practically implemented in the first part of this volume through 33 authentic, carefully selected lesson plans that form the core of this book. The range includes lesson plans for examination teaching tests, "normal" plans, and two-page lesson outlines.