Abstract
Group communication has been studied by different researchers, standardisation bodies and others. The results were of two kinds: group communication tools and communication services. Neither of them really satisfies. Group communication tools suffer from a lack of interworking, while communication services such as X.400 and X.500 lack the concept of communication within a group. In 1989 group communication was adopted as a new work item within ISO and this resulted in a new OSI service, named Group Communication Service. The suitability of the service is, however, only being proved for simple forms of communication, such as e-mail. This paper will address a very important and more difficult aspect of group communication, namely coordination, and investigate the implications for the Group Communication Service. It will also present an alternative, based on the X.500 Directory Service, for the Group Communication Service, which avoids a shortcoming of the Group Communication Service, that existing group communication tools would become isolated.
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