The Symposium on Contributions of Basic Heat Transmission Measurements to the Design and Behavior of Thermal Insulation Systems was held at the American Society for Testing and Materials Headquarters in Philadelphia, Pa., on 16-17 April 1973. The symposium was sponsored by ASTM Committee C16 on Thermal and Cryogenic Insulating Materials. R. P. Tye, Dynatech R/D Company, presided as the symposium chairman.