The Hattie study has confirmed that feedback in schools is an especially effective measure to enhance the quality of teaching and the learning success of students. PISA winners like Sweden, Finland, Canada, and Japan owe their success in no small part to a well-developed feedback culture in schools. This manual describes the various forms and methods of feedback (leadership, student, teacher, and parent feedback) and complements them with concrete examples from practice. The authors explain the concept of feedback, its origins, and related concepts of school and instructional development. Current research findings, steps to establish a feedback culture in schools, and examples from school practice round out the volume.