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This pnper describes the extensions made for adding support for group development within the Oct/VEM CAD framework.In our illlplelllelltntioll, a set of mechanisms has been incorporated into the Ott library. These contain support for versioning and concurrent access to Ott design objects.The mechanisms can be configured for estnblishment of specific design management styles. As an example, t.here is now support for organizntiou of designs in terms of workspaces; but, the number of workspaces or the relationship between them must be established externally by a design management tool. Design management tools configure these mechanisms to establish policies to be followed by the rather tools. With this architecture, integration of existing t,oola with distinct design management styles then becomes feasible.

The Version Server is a system for managing the versions and configurations of design descriptions as they change over time. In this paper we focus on the design and implementation of such a system, which we have built at U.C. Berkeley. The data model supported and the browser application are introduced to illustrate the system's user and application interface. The design decisions and details of the internal architecture are described and the system's performance is evaluated. For structure‐oriented queries, such as ‘traverse an entire chip's design hierarchy’, the Version Server is about five times as fast as comparable design management systems that store their design objects as files in a hierarchical file system.