Blogs

How usable is a website or software application? To know if design changes improved the usability of an application, you first need a baseline measure of usability from a benchmark test. Here are 10 tips to use when planning your next benchmark test. Recruit for representativeness over randomness: It will be difficult to select a random group of users for your tests. Worry less about

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Timing, luck and perseverance all play a role in making a successful product. But so does observing and understanding your customers' problems. The number of customers you need to observe will depend on how common customer behaviors are and how certain you need to be. Building a successful product means building something that customers want or need and are willing to pay for. It's not

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It is the 25th anniversary of the creation of the most used questionnaire for measuring perceptions of usability. The System Usability Scale (SUS) was released into this world by John Brooke in 1986. It was originally created as a "quick and dirty" scale for administering after usability tests on systems like VT100 Terminal ("Green-Screen") applications. SUS is technology independent and has since been tested on

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Responses to rating-scale data typically don't follow a normal distribution. However, this is unlikely to affect the accuracy of statistical calculations because the distribution of error in the measurement is normally distributed. Top-box scoring of rating-scale data can provide an easy way to summarize or segment your data in the absence of a benchmark or comparison test. Another reason top-box scores are used with rating-scale

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Are attitudes about usability constant? If we think something is unusable today, will we think it's unusable tomorrow, next week or next year? How much does prior experience affect how usable we think a websites or software is? Enough to pay attention to. In a recent assessment, prior experience boosted usability ratings 11% for websites and consumer software. But the effect of experience paled in

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The short answer is no. Whether free or paid, use software, and you have to agree to pages of legalese. So-called End User License Agreements or "EULAs" are ubiquitous. They are so common, in software and on the web, that many users ignore them and blindly click "Agree" without understanding what they're agreeing to. While you probably suspect very few users read the agreement, have

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A key aspect of usability is efficiency. Users should be able to complete tasks quickly. Efficiency is usually measured as time on task, one of the quintessential usability metrics. For transactional tasks done repeatedly, shaving a couple seconds off a time can mean saving minutes per day and hours per week for users (think Accounting, Contact Management and Order Entry). It can also mean saving

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5 Second Usability Tests: Ratings of website usability after only 5 seconds are the same as those after 10 minutes. Unmoderated Usability Data is Mostly Reliable: Data from remote usability test takers is rather similar to lab based studies except for task-times which differ more substantially. Cheaters: Around 10% of paid usability testers will cheat on your test by rushing through the questions just to

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Books Measuring the User Experience by Tom Tullis & Bill Albert Beyond the Usability Lab by Bill Albert, Tom Tullis & Donna Tedesco Practical Guide to Usability Testing by Joe Dumas & Ginny Redish Usability Engineering by Jakob Nielsen Practical Guide to Measuring Usability (also available electronically) by Jeff Sauro Handbook of Usability Testing by Jeff Rubin & Dana Chisnell Moderating Usability Tests by Joe

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This is the final outline of our book with Morgan Kaufmann. It will bring together almost a decade of research on finding the best statistical approaches to solving the most common issues in user research. Publication date is April 15 2012.Introduction & How to Use this BookVisual Guide to What TestSkipping the formulasQuantifying User ResearchWhat is User Research?Usability Tests (lab and remote)BenchmarkingComparative TestingQualitative StudiesSurveysRequirements GatheringA/B

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