Judgment—the ability to combine personal qualities with relevant knowledge and experience to form opinions and make decisions—is “the core of exemplary leadership,” according to Noel Tichy and Warren Bennis (the authors of Judgment: How Winning Leaders Make Great Calls). It is what enables a sound choice in the absence of clear-cut, relevant data or an obvious path. Likierman believes that a more precise understanding of what exactly gives someone good judgment may make it possible for people to learn and improve on it. He approached CEOs at a range of companies, from some of the world’s largest right down to start-ups, along with leaders in the professions: senior partners at law and accountancy firms, generals, doctors, scientists, priests, and diplomats. He asked them to share their observations of their own and other people’s exercise of judgment so that he could identify the skills and behaviors that collectively create the conditions for fresh insights and enable decision makers to discern patterns that others miss. As a result, he has identified six key elements that collectively constitute good judgment: learning, trust, experience, detachment, options, and delivery. He describes these elements and offers suggestions for improvement in each one.