The Symposium on Acoustic Emission was presented at the December Committee Week of ASTM held in Bal Harbour, Florida, 7-8 December 1971. The ASTM Publications Committee sponsored the symposium. R. G. Liptai, Lawrence Radiation Lab., presided as symposium chairman, and D. O. Harris and C. A. Tatro, also of Lawrence Radiation Lab., served as co-chairmen.