This collection of essays showcases recent work on Hume and the Is/Ought question. There are four distinct attempts to redefine and prove Hume's No-Ought-From-Is thesis in such a way as to evade the famous counterexamples of A.N.Prior. The rival approaches are explained and discussed together with their implications for meta-ethical theory.Preface and Acknowledgements Notes on the Contributors Introduction; C.Pigden The Autonomy of Ethics; A.N. Prior Professor Prior and the Autonomy of Ethics; J.M.Shorter Hume's Own 'Ought' Conclusions; A.C.Baier Much Obliged; W.Robison Letter From A Gentleman in Dunedin to a Lady in the Country; A Gentleman Hume's Master Argument; A.Heathcote Heathcote's Hume; A.Musgrave On Heathcote Against Hume's Law; N.Y.S. Lo Comments on 'Hume's Master Argument'; C.Pigden Comments on 'Hume's Master Argument'; G.Schurz Reply to Criticisms; A.Heathcote In Defence of Hume's Law; G.Russell The Significance of Hume's Law; H.Salw?n Snare's Puzzle/ Hume's Purpose: Non-Cogntivism and What Hume Was Really Up To With No-Ought-From-Is; C.Pigden Comments on Salw?n And Pigden; N.Y.S.Lo Reply to Lo; C.Pigden Nontrivial Versions of Hume's Is-Ought Thesis; G.Schurz On The Triviality of Hume's Law: Reply to Gerhard Schurz; C.Pigden Reply to Pigden; G.Schurz Barriers to Implication; G.Restall & G.Russell Comments on 'Barriers to Implication'; P.Vranas Comments on Restall, Russell and Vranas; G.Schurz Supervenience and the Autonomy of Ethics: Yet another Way in Which Relevant Logic is Superior to Classical Logic; E.W.Mares Moral Conclusions from Nonmoral Premises; S.Maitzen Comments on 'Moral Conclusions from Nonmoral Premises'; G.Schurz Comments on 'Moral Conclusions from Nonmoral Premises'; C.Pigden Reply to Pigden and Schurz; S.Maitzen Consolidated Bibliography IndexANNETTE C. BAIER lives in her native New Zealand. Before retiring she taught at the universities of Aberdeen, Auckland, Sydney and PittsburghADRIAN HEATHCOTE teaches philosophy at the Universitl³+