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Maintenanceraditional maintenance has proven difficult in the absence of design information [19]; maintainers often spend considerable energy trying to recover this design information before making changes [15]. Capture and reuse of certain kinds of design information should consequently improve the maintenance process. Updating the design information is as important as revising the software itself, for the revised design information is necessary for further maintenance. Four major software engineering efforts that ended in disaster precisely because trying to maintain their designs was perceived as impractical are described by [23]. Consequently, each design was abandoned and the projects spiraled into chaos.

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