In this book the authors explain how to build, and over time improve, the elements of an observation system that equips all observers to identify and develop effective teaching. It is based on the collective knowledge of key partners in the Measures of Effective Teaching (MET) project--which carried out one of the largest-ever studies of classroom observations--and of a community of practitioners at the leading edge of implementing high-quality observations in the field. From this experience, the authors have unpacked how to build the necessary skills, how to build the capacity to provide quality training, and how to collect and use data to ensure that observations are trustworthy. This book is for anyone whose work affects the quality of observation and feedback. Each chapter includes several features to support readers in turning ideas into action. These are to help practitioners answer for themselves how they can build and improve the elements of a quality observation system, by considering what such a system needs to accomplish and how others have developed a set of practices that does so. [This eBook was published by Jossey-Bass, a Wiley Brand.]