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Knowledge-based and expert systems will be important components of future integrated CAD systems. Flexibility and adaptability are of prime importance in incorporating such components into a CAD system. A model of a distributed network DBMS, using knowledge-based programming techniques, for interfacing KBS-to-DBMS is presented. In this model, the description of the data model of each KBS and DBMS component of the CAD system is represented as knowledge describing the component, making the components independent of one another. Each component issues and receives data requests in terms of its own data model, and has no knowledge of the syntax, structure and operation of the other components of the system. KADBASE, a prototype of such a flexible interface, under development is described. It demonstrates an approach to developing an integrated, distributed CAD system containing a variety of heterogeneous expert systems and design databases.