The symposium on Behavior of Deep Foundations was held during the June Committee Week of the American Society for Testing and Materials, 25-30 June 1978, in Boston, Mass. ASTM Committee D18 on Soil and Rock for Engineering Purposes sponsored the symposium. The symposium Committee members were: Raymond Lundgren, Roy Bell, R. D. Darragh, M. I. Esrig, L. C. Reese, M. T. Davisson, and F. M. Fuller. Lundgren also served as editor of this publication.