Abstract: A way to construct the object-oriented semantic data model of IN user service data according to the principles of TMN is presented. GDMO is taken as the specification tool to specify IN user service data . In the specification, the first-order predicate logic is used to specify the structure and the integrity constraints of user service data, and also new specifiers are introduced to specify theoperations on the attributes of user service data. The semantic data model of user service data is a preparation for the automatic implementation of user service managment in IN.

Key words: intelligent networks, telecommunication managementnetwork, management information model, intelligent network service managementsystem