For several years now it has been the practice of Oxford University
Computing Laboratory, with the co-oi)eration of external lecturers and of the
Delegacy for Extra-Mural Studies, to arrange sholt Summet Schools in
Oxford on various topics in or around the field of computation. This book is
based on the Summer School held in September 1965, which was attended by
some seventy people drawn mainly from xiniversity and other computing
installations throughout Great Britain.
The Editor would like to take this opportxinity to record his gratitude to
Professor Fox for the invitation to organize this course and for his much-
needed encouragement and advice, to all his fellow authors for the long time
spent in preparation and the short time spent in redrafting for publication, to
the staff of the Delegacy for the smoothness of all the adininistrative and
domestic arrangements, to Miss O. Moon for accurately and uncomplainingly
typing the manuscript, and to the staff of the Pergamon Press for seeing it
through to publication. Finally he must thank all the participants in the
Summer School, and particularly those whose criticisms or other remarks
have helped him in the making of this book.