Approximating Task Completion When You Can’t Observe Users

If users can’t complete a task, not much else matters. Consequently, task completion is one of the fundamental UX measures and one of the most commonly collected metrics, even in small-sample formative studies and studies of low-fidelity prototypes. Task completion is usually easy to collect, and it’s easy to understand and communicate. It’s typically coded as

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How to Determine Task Completion

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

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When to Provide Assistance in a Usability Test

One of the fundamental principles behind usability testing is to let the participants actually use the software, app, or website and see what problems might emerge. By simulating use and not interrupting participants, you can detect and fix problems before users encounter them, get frustrated, and stop using and recommending your product. So while there’s

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How Reliable Are Self-Reported Task Completion Rates?

Did you do that task correctly? Unmoderated testing provides many benefits. The most notable of which is the ability to collect metrics from a large and geographically diverse sample of participants quickly. A common metric collected in usability tests is the task completion rate. It’s often called the fundamental usability metric because if users can’t complete

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The High Cost of Task Failure on Websites

It’s often called web surfing or web browsing, but it probably should be called web doing. While there is still plenty of time to kill using the web, in large part, we’re all trying to get things done. Purchasing, reserving, comparing and communicating—Internet behavior is largely a goal directed activity. If a website doesn’t help

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10 Things To Know About Completion Rates

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

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Usability and Net Promoter Benchmarks for Consumer Software

Many software companies track and use the Net Promoter Score as a gauge of customer loyalty. Positive word of mouth is a critical driver of future growth. If you have a usable product, customers will tell their friends about the positive experience. And alternatively, a poor user experience will lead customers to tell their friends

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What Is A Good Task-Completion Rate?

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

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Margins of Error in Usability Tests

How many users will complete the task and how long will it take them? If you need to benchmark an interface, then a summative usability test is one way to answer these questions. Summative tests are the gold-standard for usability measurement. But just how precise are the metrics? Just as a presidential poll uses a

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Calculating Sample Size for Task Completion (Discrete-Binary Method)

One of the biggest and usually first concerns levied against any statistical measures of usability is that the number of users required to obtain “statistically significant” data is prohibitive. People reason that one cannot with any reasonable level of confidence employ quantitative methods to determining product usability. The reasoning continues something like this: “I have

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