The Second Conference on Composite Materials: Testing and Design was held 20-22 April 1971 in Anaheim, Calif. Committee D30 on High Modulus Fibers and Their Composites of the American Society for Testing and Materials sponsored the conference, in conjunction with the American Institute of Mining, Metallurgical and Petroleum Engineers. H. T. Corten of the College of Engineering, University of Illinois, served as conference and program chairman. Of the 53 papers presented at the ten sessions, 36 are included in the volume, which complements the first conference publication, ASTM STP 460, Composite Materials: Testing and Design.