C. FRED ALFORD is Professor of Government and Distinguished Scholar-Teacher at the University of Maryland, College Park, USA ANDREW BROOK is Professor of Philosophy and Director of the Institute of Interdisciplinary Studies at Carleton University, Ottowa, Canada ILHAM DILMAN was Professor Emeritus of Philosophy at the University of Wales, Swansea, UK GRANT GILLETT is Professor of Medical Ethics at the University of Otago in Dunedin, New Zealand W.D.HART is Chair of the Philosophy Department at the University of Illinois at Chicago, USA JAMES HOPKINS is Reader in Philosophy at King's College London, UK SUZANNE R. KIRSCHNER is Assistant Professor of Psychology at the College of the Holy Cross in Worcester, Massachusetts, USA MICHAEL P. LEVINE is Professor of Philosophy at the University of Western Australia and Weismann Distinguished Professor at Baruch College, City University of New York, USA MALCOLM BRUCE MACMILLAN is an Adjunct-Professor in the School of Psychology at Deakin University, Australia TAMAS PATAKI is Honorary Senior Fellow in the Department of Philosophy, University of Melbourne, Australia, and Honorary Fellow, Deakin University, Australia DAVID LIVINGSTONE SMITH is Director of the New England Institute for Cognitive Science and Evolutionary Psychology, and Visiting Professor of Philosophy at the University of New England, USA.