This book opens up new directions in judgment and decision making research. Our society and academic research have largely neglected the fact that sound judgment and decision making are the crux of many professions. This volume explores metacognitive processes as an enabler of competence at decision making. Offering a new analysis of competence, by understanding and communicating what professional decision makers do, this book provides valuable contributions to the judgement/decision making field as well as the professional community at large.