This collection contains essays that provide definitive and accessible accounts of recent research on some of the most important topics in the theory of decision-making and organization-design with incomplete information. Aimed primarily at nonspecialists, some of the essays indicate the limitations of accepted paradigms and suggest directions of future research. Graduate students contemplating careers in economic theory will find the volume a particularly stimulating source of research topics. It can also serve as an item on the reading list of courses on advanced microeconomic theory, information theory, game theory and organization theory.