This book is centered on the differential and integral calculus. This calculus is a main focus of the mathematics curriculum in the 12th grade in Waldorf schools. This domain offers on the one hand inexhaustible possibilities for exploring possibilities for exploring philosophical as well as mathematical questions. On the other hand, college preparatory exams require mastery of a variety of challenging application areas. This volume brings together numerous articles of a fundamental nature describing how to access this theme for classroom presentation. There are also contributions on the deeper significance of the infinitesimal calculus, and on the concept of infinity. Articles on general educational methodology round off the volume.