The use of visual programming in its infancy and few good representations of abstract objects have been developed. It is possible, nonetheless, to adapt representations now being used as a medium for discussing algorithms and to examine how they function in visual programming paradigms. It is contended that state transition diagrams should be applied to the new paradigm of visual programming. The state transition diagram language used here is part of a methodology for designing and specifying user interfaces. To reduce the complexity of the designer's task, the process of designing and programming a user interface is divided into three levels, and a notation suitable for each level is provided.
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