Original papers by outstanding scholars (including Nobel laureate John C. Harsanyi) critically examine and extend the most important aspects of Richard Brandts seminal work on the roles of rationality, rules, and utility in developing a coherent account of normative ethics. Brandt provides a set of valuable detailed responses to these new papers. For more than forty years, Richard Brandts work has been at the cutting edge of research into the roles played by rationality, rules, and utility in developing a coherent account of normative ethics. In this volume of original essays, outstanding scholars (including Nobel laureate John C. Harsanyi) critically examine and extend the most important aspects of his work. The value of these new contributions is enhanced by Brandts detailed responses. Scholars of ethics, and of human behavior more generally, will find this book consistently stimulating and rewarding.