The specification and design of a Complex piece of equipment generally begins with the needs of end users: what users need to accomplish with the product and the circumstances or environment in which they will use it. However, throughout much of the design cycle for many embedded systems, the human-interface display may be little more than a placeholder in the overall product specification. This placeholder may have some basic specifications, such as mechanical constraints that define the display dimensions, and cosmetic or subjective requirements based on assumed market wants or needs. But all too often, an engineer faces the task of finding a color 6.5-in. VGA flat-panel display for reasons no more specific than "be-cause that's what the com-petitor's product uses." There is a better way.
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