Here are five practical tips we’ve learned. But it’s also a new method and the more it’s used, the more questions come up and the more the method can evolve to better address the needs of its practitioners. It’s not a substitute for usability testing, but like other analytic techniques, such as an expert review or keystroke level modeling, it’s a cost-effective technique to identify problems in an interface when testing with actual users is too expensive or difficult. It relies instead on experts making judgments on the difficulty they think users would have as they work through the steps users would take to complete tasks. It’s not based on directly observing users trying to complete tasks in an interface. The step is difficult for the target user, due to significant cognitive load or confusion some target users would likely fail the task at this point. The step requires some degree of cognitive load by the target user but can generally be accomplished with some effort. The step can be accomplished easily by the target user, due to low cognitive load or because it’s a known pattern, such as the acceptance of Terms of Service agreements. PURE stands for Practical Usability Rating by Experts.Įvaluators familiar with UX principles and heuristics decompose tasks into small steps and rate each step based on a pre-defined scoring system (called a rubric), as shown in Figure 1.
In an earlier article, I described the PURE methodology.
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