Improving the Prediction of the Number of Usability Problems

Paraphrasing the statistician George Box, all models are wrong, some are useful, and some can be improved. In a recent article, we reviewed the most common way of modeling problem discovery, which is based on a straightforward application of the cumulative binomial probability formula: P(x≥1) = 1 – (1-p)n. Well, it’s straightforward if you like

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Is Usability Testing Effective?

Questioning the effectiveness of usability testing may sound like a relic from the past. In the early years of industrial usability engineering, there was a constant need to justify the activity of (and your job in) usability testing. The book Cost-Justifying Usability (Bias & Mayhew, 2005) speaks to this. Usability testing has since gained significant

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What’s the Difference Between Pragmatic and Hedonic Usability?

Is a usable experience sufficient for a good experience? Assuming a product, website, or app does what it intends to do and is usable, is there anything more? Usability testing tends to focus on the objective task-oriented performance quality of an experience. What about aspects such as innovativeness, originality, or beauty? Do these matter? If

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Three Goals of Usability Testing

The fundamental goal of usability testing is to produce highly usable products and services. That’s an uncontroversial statement. Where things can get a bit confusing is how different approaches to usability testing have different ways of achieving that goal. In earlier articles we have described the different types of usability tests but many types still

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Practical Tips for Running a PURE Evaluation

In an earlier article, I described the PURE methodology. PURE stands for Practical Usability Rating by Experts. Evaluators 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. Figure 1: Scoring rubric for PURE. The PURE

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15 Mobile UX Facts & Insights (2018)

Mobile technology continues to evolve at a rapid pace. To help keep up, we pulled together relevant insights about the mobile user experience and mobile usage in general. This is an updated article to the 2017, 2016, 2015, and 2013 articles based on published data and our own mobile UX research. Cellphones are ubiquitous. A Pew Research

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The User Experience of Health Insurance Websites

For most people, going to the doctor isn’t fun. Is the doctor in your network? How much will the visit cost? What if a CT scan is ordered? And when the bill comes, what the heck does EOB mean? What does or doesn’t your insurance cover? A visit to your health insurance website should help,

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How Much Does a Usability Test Cost?

Usability testing is expensive. At least that has been the perception. But the idea that usability is a nice-to-have ideal that only big companies such as IBM or Microsoft can afford has fortunately evolved. While technology has improved and gotten cheaper, it’s the technique that’s become more accessible and accepted. The discount-usability movement helped emphasize the effectiveness

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