These proceedings contain the papers presented at the Third International Conference and Exhibition on Engineering Software held at Imperial College, London during the period April 11th - 13th, 1983. I must thank again the authors who submitted the large numbers of papers which made selection a difficult task. The theme of the conference is the use and application of computers in engineering. Many abbreviations have been invented to describe the use of computers from CAD, CAM, CADMAT etc. but the term which best describes the scope of the conference is Computer Aided Engineering, CAE. The...