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Current practice in Human Computer Interaction as encouraged by educational institutes, academic review processes, and institutions with usability groups advocate usability evaluation as a critical part of every design process. This is for good reason: usability evaluation has a significant role to play when conditions warrant it. Yet evaluation can be ineffective and even harmful if naively done 'by rule' rather than 'by thought'. If done during early stage design, it can mute creative ideas that do not conform to current interface norms. If done to test radical innovations, the many interface issues that would likely arise from an immature technology can quash what could have been an inspired vision

The definition of usability is sometimes reduced to "easy to use," but this over-simplifies the problem and provides little guidance for the user interface designer. A more precise definition can be used to understand user requirements, formulate usability goals and decide on the best techniques for usability evaluations. An understanding of the five characteristics of usability - effective, efficient, engaging, error tolerant, easy to learn - helps guide the user-centered design tasks to the goal of usable products.

"[With eyetracking] we can see that a user may navigate the page of an interface that houses the info she wants," she said, "but if the text is poorly presented, or the navigation is cluttered, or there are too many superfluous images so she cannot easily find what she needs. This is a lost opportunity.

First, people aren't really interested in what we do; they're interested in the results that we deliver. Second, running around and selling things is not as effective as actually applying your design skills to problems that matter. In many ways, business people look at things and size up the problems. They may avoid complex variables - the who, what, where - simply because they are complicated factors.

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