This book provides educators with a step-by-step introduction to planning and implementing the Peer Instruction teaching method in physics. With the German translation of the book by Harvard Professor Eric Mazur, who developed and first employed this method, educators receive immediately applicable, well-thought-out teaching materials for introductory physics courses in all technical and scientific degree programs. The first part presents the fundamental philosophy of Peer Instruction. The second part includes: 243 comprehension questions in multiple-choice format, 109 understanding tasks for the physics exam, and two proven diagnostic tests that assess students' conceptual understanding of Newtonian mechanics. All mentioned teaching materials for educators are available on the publisher's website for the book.