This year, the subject for the Duke of Edinburgh Lecture was chosen by the President and the Council as a result of recommendations made by the Educational Sub-Committee. Although the lecture was to be an individual contribution it was to have the full help and support of the Institute. Without this, the lecture would have been impossible, and therefore it seemed necessary to make acknowledgments at the outset.

Help has been given most freely and generously by many Fellows and Members, and in particular by the President, Professor A. Stratton, by Dr. G. E. R. Deacon, F.R.S., the Chairman of the Educational Sub-Committee, and its members, Captain C. H. Cotter and H. E. Smith, by D. H. Sadler, the Chairman of the Membership and Fellowship Committee, by Captain F. L. Main, a member of the Council, and by M. W. Richey, the Executive Secretary. Further invaluable suggestions came from many sources outside the Institute, notably from Dr. A. Clow of the B.B.C., J. A. Edgar of the Department of Education and Science, Dr. H. F. Huddleston of R.A.E., Farnborough, and Professor S. Sutherland of Sussex University. Finally, a very special word of thanks to B. W. Lucke, Schools Inspector, Liverpool. This paper owes a great deal to his ideas and to his inspiration.