The Seventh International Congress on Catalysis was held in the Keio Plaza Hotel, Tokyo, June 30-July 4, 1980. The proceedings were copublished in 1981 by Kodanaha Ltd., Tokyo and Elsevier, Amsterdam. The proceedings will include the plenary lectures (5), contributed papers (104), abstracts of communications (64), and the discussion of contributed papers. It is unfortunate for those who did not attend that discussion of the communications could also be included. The communications were an excellent innovation and, it may be hoped, a new tradition for future Congresses. They had a later acceptance date than contributed papers and were limited in length to 20% of that allowed for regular papers (10 pages). All communications were presented on the opening day of the Congress. Because they were brief and, in many cases, were research progress reports, the discussion was lively.