The ELECTROPIA is a CALS/EC engine developed by the Korea CALS/EC Association composed of the government, several universities, and many small and big companies in Korea, in order to develop and procure standard-public-parts, support electronic commerce, and make use of Internet shopping mall and technical information owned in common. This paper will present what is the ELECTROPIA and it's subsystems. The ELECTROPIA has four principal subsystems. The first subsystem is the Electronic Tendering System(ELECTROPIA-ETS) which assists those who want electronic transfer globally. The second is the Technical Information System(ELECTROPIA-TIS) which makes each company work together by owning technical information companies especially between small and big companies in Korea. The third is the Customer Service System(ELECTROPIA-CSS) which enables joint service to customers using an electronic manual among companies. Finally, the last one is the Electronic Shopping Plaza(ELECTROPIA-ESP) whi...