Unified model of national data: Development scenarios

The problem of information interaction between heterogeneous information systems is considered. Such point of view is taken that this problem must be solved by creating, implementing, and maintaining unified data models within the main sections of the subject areas. In the perspective, the scope must be enlarged so as to encompass the entire subject area of information interaction on a national scale. Based on the ontological approach, the author proposes the solution to the problem of finding effective as well as optimal ways to form national data models. The scenarios of integration of departmental systems are considered as well.