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.

ANNETTE C. BAIER lives in her native New Zealand. Before retiring she taught at the universities of Aberdeen, Auckland, Sydney and Pittsburgh ADRIAN HEATHCOTE teaches philosophy at the University of Sydney, Australia NORVA Y. S. LO is a Lecturer in the Department of Philosophy, La Trobe University, Melbourne, Australia STEPHEN MAITZEN is Associate Professor and Head of the Department of Philosophy at Acadia University, Nova Scotia, Canada EDWIN MARES is Professor of philosophy at Victoria University of Wellington, New Zealand ALAN MUSGRAVE is Professor of Philosophy at the University of Otago, New Zealand ARTHUR PRIOR (1914-1969) was one of the greatest logicians (and most interesting philosophers) of the Twentieth Century GREG RESTALL teaches Philosophy at the University of Melbourne, Australia WADE L. ROBISON is Ezra A. Hale Professor of Applied Ethics at the Rochester Institute of Technology, USA GILLIAN RUSSELL is Assistant Professor at Washington University in St Louis, USA HÅKAN SALWÉN teaches philosophy at Stockholm University, Sweden GERHARD SCHURZ is Head of the Philosophy Department, University of Duesseldorf, Germany J.M SHORTER taught at Aberdeen, and at the University of Canterbury, Christchurch, first as a Lecturer and then as Professor (in succession to Arthur Prior). He lives in retirement at Oxford. PETER B. M. VRANAS is Associate Professor of Philosophy, University of Wisconsin-Madison, USA