For centuries, teachers have been lone warriors, with lessons taking place behind closed doors. However, peer classroom visits followed by feedback are a simple and effective method for teaching more easily and better. This book presents various methods of peer classroom observation and offers practical examples and guidelines. School leaders will find practical support for a comprehensive concept that benefits not only the quality of teaching but also team development and feedback culture. It includes a workshop section and a newly developed competency framework that provides indicators for all teaching-related competencies.