Alan Watkins' new book 4D Leadership is built around the concept of "vertical development" when leaders expand their capabilities to see further, understand more, think better, and become more sophisticated and flexible in the way they approach people and situations. Vertical development focuses on being able to think more complexly, systemically, and strategically, whereas horizontal development consists of learning new skills and knowledge. Vertical development, or the fourth dimension, is crucial in today's volatile, uncertain, complex, and ambiguous business world; without it,...