The formation of the International Advisory Council for Biosystematic Services in Entomology (IACBSE) in Hamburg at the XVIIth International Congress of Entomology in 1984 is described and its composition and long-term objectives are stated. These include fostering the development of biosystematic research and identification services on a world basis by co-ordinating and assisting interactions and exchange of information between organizations and individuals, and by establishing a series of Working Groups on major projects. The main user needs for biosystematic services are also summarized. The particularly important needs of medical, agricultural and forestry entomology are emphasized and other needs for the support of faunal surveys, conservation, ecology, physiology, biogeography, litigation, amateur and general public interest are noted.