The 1983 Final Report of the International Maize Testing Program includes trial summaries of data received from February 16 to December 15, 1984. Data from 1983 trials received after December 16, 1984 will be in cluded as an addendum to the 1984 Preliminary Report. The previously published 1983 Preliminary Report and this 1983 Final Report include data provided by national maize scientists from 71 countries. These reports are the result of carefully conductid trials and the timely return of complete and accurate data by hundreds of collaborators. The CIMMYT staff recognizes the immense value of this collaboration, and wish to express their