Book excerpt: With the increase in the number of organizational leadership development programs, there is a pressing need for evaluation to answer important questions, improve practice, and inform decisions. The Handbook is a comprehensive resource filled with examples, tools, and the most innovative models and approaches designed to evaluate leadership development in a variety of settings. It will help you answer the most common questions about leadership development efforts, including: What difference does leadership development make? What development and support strategies work best to enhance leadership? Is the time and money spent on leadership development worthwhile? What outcomes can be expected from leadership development? How can leadership development efforts be sustained?