By Professor Martyn Hammersley (Professor in Educational and Social Research, The Open University)
By R. C. Muirhead-Thompson (Royal Holloway and Bedford New College, University of London, Egham, Surrey, U.K.)
By Arie H. Bartal, Yashar Hirshaut
By A. Aitken (Medical Research Council, National institute for medical research, London)
By B. D. Hames, David Rickwood