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Within the present thesis, the authors refer to the features and functionalities of a general purpose distributed heterogeneous database architecture, capable of supporting a wide spectrum of software applications (AI, Expert Systems, Software Engineering Environments e.t.c.). The overall skeleton of this study is as follows: Overview of existing systems and methodologies. Analysis of the semantics of existing models. The proposed architecture under the light of the existing theoretical aspects. The object oriented approach in the global database modeling. Inter-model transformations within the global modeling facility. Structural specification of the global query language. Functional features of the global data manager.