Publisher Summary This chapter identifies characteristics that differentiate solid user interface (SUI) from graphical user interfaces (GUIs) and highlights the different methods for analysis, design, and testing that SUIs require. As touch-screen technology develops, and GUI design aims for increased realism in portraying three-dimensional objects on two-dimensional screens, screen-based solutions may be regarded as a universal answer to information handling problems. They have the advantages of flexibility and relatively low manufacturing costs. However, there are many environments in which SUIs are the most appropriate technology, and a growing understanding of both products and environments of use is necessary to ensure that solutions are applied appropriately. The chapter describes that organizations developing products with either GUIs or SUIs need to research their users' needs and to test prototype products with users as early and as often as they can.
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