The Pacific Regional Science Conference Organisation (PRSCO) was established at the 7th Annual Meeting of the Western Regional Science Association (WRSA) in San Diego, February 1-4, 1968 at the initiative of representatives from WRSA and the Japan Section of the Regional Science Association (JSRSA). Their first conference of PRSCO was held at the East-West Center, University of Hawaii, August 26-29, 1969. Subsequently, full conferences and smaller meetings have been held in Australia, Canada, Japan, Korea, Mexico, New Zealand, Singapore, Taiwan and the United States. For further details, see the Annex. A full international conference is held every second year and a smaller summer institute in alternate years.