This book explains how to measure the impact of leadership coaching and why it matters. It challenges current thinking that the return on investment from leadership coaching is too complex to measure, limited to budgetary accountability or coaching advocacy. Instead, Jamieson and Wall argue that the evaluation of leadership coaching can be a highly effective tool to assist both the coach and the organisation in informing the future direction of leadership strategies. This book provides diagnostic tools for coaching evaluation, templates for assessment and activities for reflective practice to ensure that effectiveness can still be measured. The authors use ambidexterity (short term versus long term decision making) as a tool for coaches in the design of an evaluation system that is simultaneously workable and strategically helpful, presenting four unique case studies that span different organisational sectors. This is an important book, not just for coaches, but for anyone interested in leadership development for complex times.