The sixth annual Cambridge Conference met to discuss ‘How to Make Aid More Effective through Co-operation’, with Dr R. E. Robinson again in the chair. Six donor and 34 recipient countries were represented by some 150 participants; background papers were presented by Chief Adebo, Professor Hollis Chenery, Professor Willard Thorp, Professor H. V. Wiseman, Dr J. A. Adler, DrT. Balogh, Dr I. G. Patel, Dr C. Quintana, J. Audibert, David Owen, S. S. Khera, Rashid Ibrahim, J. H. Mensah, Tun Razak, and Roger Swynnerton. Among other conference members were Professor G. M. Meier, Professor Lopes Rodrigues, Professor David Joslin, Professor E. A. Mauck, Dr Hans Singer, Dr Hassan Saab, Dr E. F. Schumacher, Dr S. Lourie, Dr T. Soper, Lady Ursula Hicks, and John Miller.