Erik de Haan and Nadine Page report on the largest quantitative coaching outcome study to date which they believe breaks new ground and will help to improve the effectiveness of coaching relationships. Coaches have long sought to improve their coaching conversations and have frequently questioned the effectiveness of their work and the impact it has on helping clients to meet their objectives. However, despite being curious about the effectiveness or outcome of their coaching practices, there have been few serious attempts to explore the propensity of...