G.R. BERRIDGE is Professor of International Politics at the University of Leicester. He is General Editor of the Macmillan/St Martin's Press Studies in Diplomacy series and Associate Editor of OUP's New Dictionary of National Biography. His most recent books include International Politics: States, Power and Conflict since 1945 (3rd edition 1997), Talking to the Enemy: How States without 'Diplomatic Relations' Communicate (1994), Diplomacy: Theory and Practice (2nd edition 1999), and together with Alan James, a Dictionary of Diplomacy. - MAURICE KEENS-SOPER, a freelance writer, was formerly a Lecturer in the Department of Politics at the University of Leicester from 1964 until the end of the 1980s. In 1995 he was appointed a University Fellow in the University of Leicester and in 1997 won first prize in the Philip Morris Institute Europe Essay Competition. He is co-editor of Guide to the Political Classics and his most recent work is Europe and the World. - T.G. OTTE is Lecturer in International History at the University of the West of England, Bristol. He is the co-editor of Military Intervention: From Gunboat Diplomacy to Humanitarian Intervention (1995) and Personalities, War and Diplomacy: Essays in International History (1997), and the editor of The Makers of British Foreign Policy: From Pitt to Thatcher.