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In this paper, we present the design and implementation of Database User Interface Design Editor which employs the WYSIWYG approach for users to interactively access and manipulate user interface widgets and database widgets to build database interfaces. By binding UIMS techniques with the database primitives, the editor provides a platform to fast prototype UIs and rapidly create reusable graphical constructs for representing database objects. It makes design-test-modify cycle which is universally recognized as the only efficient way to successful UI design an easier task by supporting two design modes – development mode arid simulation mode. The simulation mode allows users to visualize the actual behaviour of the interface under development at any time without having to compile and run the interface codes created. Users can switch between these two modes.