Usability Metrics

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Task completion is one of the fundamental usability metrics. It’s the most common way to quantify the effectiveness of an interface. If users can’t do what they intend to accomplish, not much else matters. While that may seem like a straightforward concept, actually determining whether users are completing a task often isn’t as easy. The ways to determine task completion will vary based on the

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Many factors, including features and price, influence whether customers recommend software products. But usability consistently tops the list of key drivers of customer loyalty. Typically, usability accounts for between 30% and 60% of the "why" when customers do or don't recommend products. A positive experience leads more customers to recommend a product. A negative experience, predictably, causes customers to actively discourage others from buying a

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Quantifying the user experience is the first step to making measured improvements. One of the first questions with any metric is "what's a good score?". Like in sports, a good score depends on the metric and context. Here are 10 benchmarks with some context to help make your metrics more manageable. 1.  Average Task Completion Rate is 78%: The fundamental usability metric is task completion.

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Everything should be 1 click away. It takes too many clicks ! For as long as there have been websites it seems that there's been a call to reduce the number of clicks to improve the user experience. This was especially the case after Amazon released its one-click purchase button in 1999. Executives, product managers and developers at one point have all joined the call

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Completion rates are the fundamental usability metric: A binary measure of pass and fail (coded as 1 or 0) provides a simple metric of success. If users cannot complete a task, not much else matters with respect to usability or utility. Easy to understand: They are easy to collect and easy to understand for both engineers and executives. You don't need to be a statistician

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If a user can't find the information does it exist? The inability of users to find products, services and information is one of the biggest problems and opportunities for website designers. Knowing users' goals and what top tasks they attempt on your website is an essential first step in any (re)design. Testing and improving these task experiences is the next step. On most websites a

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It depends (you saw that coming). Context matters in deciding what a good completion rate is for a task, however, knowing what other task completion rates are can be a good guide for setting goals. An analysis of almost 1200 usability tasks shows that the average task-completion rate is 78%. The Fundamental Usability Metric A binary task completion rate is one of the most fundamental

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In usability testing we ask users to complete tasks and often ask them to rate how difficult or easy the task was. Does it matter when you ask this question? What happens if we interrupt users during the task instead of asking it after the task experience is over? Almost ten years ago researchers at Intel asked 28 users to complete various tasks across websites

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There are many helpful books on usability testing. It is also helpful to know what actually happens in usability tests, including what metrics people collect. I asked MeasuringU newsletter subscribers to answer a few questions about how they measure usability. Sign up for weekly updates at the bottom of this page. In addition to the number of users tested, I also asked about what data

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