The symposium on MiCon 78: Optimization of Processing, Properties, and Service Performance Through Microstructural Control was held in Houston, Texas, 3-5 April 1978. Sponsored by Committee E-4 on Metallography of the American Society for Testing and Materials, the symposium was also cosponsored by The Metallurgical Society of the American Institute of Mining, Metallurgical, and Petroleum Engineers, the International Metallographic Society, and the Houston Chapter of the American Society for Metals. Dr. Halle Abrams, Bethlehem Steel Corporation, G. N. Maniar, Carpenter Technology Corporation, D. A. Nail, Cameron Iron Works, and Dr. H. D. Solomon, General Electric Company are editors of this publication.