The Symposium on Fatigue Crack Growth Under Spectrum Loads washeld on 23-24 June 1975 at the Seventy-eighth Annual Meeting of theAmerican Society for Testing and Materials in Montreal, Quebec,Canada. Committee E24 on Fracture Testing of Metals and CommitteeE09 on Fatigue sponsored the symposium. R. P. Wei, LehighUniversity, and R. I. Stephens, The University of Iowa, served asthe symposium cochairmen. Serving as members of the SymposiumOrganizing/Program Committee and as session chairmen were J. M.Barsom, U. S. Steel Corp.; W. G. Clark, Jr., Westinghouse R & DCenter; N. E. Dowling, Westinghouse R & D Center; C. M. Hudson,NASA Langley Research Center; E. K. Walker, Lockheed CaliforniaCo.; and Howard Wood, AFFDL/FBR, Wright-Patterson AFB.