Thesis: Ph. D., Massachusetts Institute of Technology, Department of Linguistics and Philosophy, 2016.Cataloged from PDF version of thesis.Includes bibliographical references (pages 87-95).This dissertation offers a theory of praise and blame: praiseworthy acts manifest virtue and blameworthy acts are incompatible with virtue. Despite its simplicity, proposals like mine have been largely ignored. After all, don't good people sometimes deserve blame, and bad people sometimes deserve praise? I believe the significance of this thought has been exaggerated. The chapters of this dissertation argue that we should understand praiseworthiness and blameworthiness by appeal to the concept of virtue, even granting the possibility of uncharacteristic b...