x the early stages, to the Programme Committee for their assistance in formulating the programme and for their continued support throughout, to the session chairmen and scientific secretaries, who ensured the smooth running of the proceedings, and to all the delegates, who, by their full participation and lively discussions have demonstrated the continuing vigour of this field of physics. We also gratefully acknowledge the sponsorship of the Institute of Physics, the British Council and IUPAP, and thank the Royal Society for additional financial support. Our thanks also are due to Chester College for their hospitality, to SERC Daresbury Laboratory for organi­ zational support and for providing the conference staff at Chester. Finally, we owe a particular debt of gratitude to Mrs. Shirley Lowndes and Mrs. Christine Lloyd (Jackson) for their continuous and efficient work as mainstays of the conference organization. J.S. Lilley and M.A. Nagarajan International Scientific Advisory Committee A. Arima 11.V. !!ihailovic Brink V.G. Neuclatchin D.lI. D.A. Bromley J.O. Newton A. Dudzanowski D. Robson E.G. Giraud II. Tanaka 11. Harvey Y.C. Tang H.D. Holmgren A. Van der \loude D.F. Jackson \J.T.n. van Oers B.K. Jain A. IJeiguny Kin?, Sing Nan K. lJildermuth P. Krager Programme Committee D.lI. Brink G.C. Horrison L.L. Green 11. A. Nagarajan D.F. IJ. R.