The tremendous interest in upper-air measurement quality by the meteorological community brought together experts from many agencies at a Workshop on Upper-Air Measurements and Instruments. The workshop was held at NASA's Wallops Island facility on 14–15 November 1989. The purpose of the workshop was to establish a forum for the interchange of information to discuss mutual problems and to provide a basis for future work. A major recommendation of the workshop was for the development of a reference radiosonde instrument. A description of the workshop highlights are presented.