The scientific output of major institutions in Thailand was examined from the number of international publications covered byScience Citation Index (SCI), publications inJournal of the Science Society of Thailand (J. Sci. Soc. Thailand) and abstracts presented at the annual symposium of the Science Society of Thailand. A good correlation (r=0.92) was observed between the number of publications covered bySCI and inJournal of the Science Society of Thailand, while a poorer correlation (r=0.73) was observed between the former and the number of symposium abstracts.