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We discuss the design and implementation of VISAGE, an object-oriented user interface framework that is part of GE's FACE Flexible Architecture Compiler Environment . High-level services include a domain-independent graph editor that provides standard methods for viewing and editing hierarchical graphs, including graph layout. Editors that are customized to a specific application are built by inheritance of the domain-independent graph editor's functionality and overloading of the display, selection and editing methods. At a lower layer, presentation objects are responsible for parsing user input, displaying application output, providing mouse sensitivity and command dialogue execution. These presentation objects separate the application from its user interface, and thus promote system modularity.