{"id":26513,"date":"2025-01-14T15:17:08","date_gmt":"2025-01-14T15:17:08","guid":{"rendered":"https:\/\/peraltafinancing.com\/analytics\/how-many-people-do-you-need-to-see-trip-on-your-carpet-before-fixing-it-measuringu\/"},"modified":"2025-01-14T15:17:08","modified_gmt":"2025-01-14T15:17:08","slug":"how-many-people-do-you-need-to-see-trip-on-your-carpet-before-fixing-it-measuringu","status":"publish","type":"post","link":"https:\/\/fivemor.com\/?p=26513","title":{"rendered":"How Many People Do You Need to See Trip on Your Carpet Before Fixing It? \u2013 MeasuringU"},"content":{"rendered":"<p> <br \/>\n<\/p>\n<div>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-43149 size-medium alignleft\" src=\"https:\/\/measuringu.com\/wp-content\/uploads\/2024\/12\/FeaturedImage-121724-5-300x169.png\" alt=\"feature image\" width=\"300\" height=\"169\" srcset=\"https:\/\/measuringu.com\/wp-content\/uploads\/2024\/12\/FeaturedImage-121724-5-300x169.png 300w, https:\/\/measuringu.com\/wp-content\/uploads\/2024\/12\/FeaturedImage-121724-5-1024x576.png 1024w, https:\/\/measuringu.com\/wp-content\/uploads\/2024\/12\/FeaturedImage-121724-5-768x432.png 768w, https:\/\/measuringu.com\/wp-content\/uploads\/2024\/12\/FeaturedImage-121724-5-1536x864.png 1536w, https:\/\/measuringu.com\/wp-content\/uploads\/2024\/12\/FeaturedImage-121724-5-2048x1152.png 2048w, https:\/\/measuringu.com\/wp-content\/uploads\/2024\/12\/FeaturedImage-121724-5-600x338.png 600w\" sizes=\"(max-width: 300px) 100vw, 300px\"\/>You invite your friends over for a gathering at your house.<\/p>\n<p>As the party gets started, you watch in horror as a friend trips on the edge of your carpet before she even takes the first sip of her Cabernet (now spilled on your white couch).<\/p>\n<p>You rush to fix the carpet. But before you do this, you hesitate. You\u2019re a researcher!<\/p>\n<p>Researchers don\u2019t jump to conclusions. They take a measured approach to finding and fixing problems. And that starts with being careful not to jump to a conclusion after one observation.<\/p>\n<p>You recall the <a href=\"https:\/\/measuringu.com\/five-history\/\">Magic Number 5<\/a> and how to compute a <a href=\"https:\/\/measuringu.com\/specific-sample-sizes-in-problem-discovery-studies\/\">sample size for problem discovery studies<\/a>, so you patiently wait for the next four guests to enter the living room and observe what happens.<\/p>\n<p>How many people <strong>do<\/strong> you need to observe tripping on the carpet before you have evidence of a real problem?<\/p>\n<p>Seems like a pretty dumb idea to wait for more people to trip. Is it also a dumb idea to wonder what sample size you need to detect problems in usability studies?<\/p>\n<p>We\u2019ve heard versions of this story and read similar rationales posed by other researchers. We think the parable is both helpful and deceiving.<\/p>\n<p>The parable is helpful for a few reasons.<\/p>\n<ol>\n<li>Once you see a problem, there\u2019s no longer a question of whether it exists. It does. The discussion shifts from discovery to recovery\u2014is the problem serious enough to deserve the allocation of resources to fix it, and if so, what needs to be done to fix it?<\/li>\n<li>Just one user can provide powerful insights on what problems to fix.<\/li>\n<li>It reinforces the idea that the severity of a problem should be treated <a href=\"https:\/\/measuringu.com\/article\/the-relationship-between-problem-frequency-and-problem-severity-in-usability-evaluations\/\">independently of the frequency<\/a> (especially when a problem is obviously severe).<\/li>\n<li>It\u2019s a reminder that overrecruiting is a waste of resources if you really don\u2019t need more participants.<\/li>\n<\/ol>\n<p>The story is deceiving primarily because of how it\u2019s framed.<\/p>\n<p>How many participants do you need to see trip on your carpet before you decide it\u2019s a problem serious enough to fix? In its more general form, once you\u2019ve seen something that is obviously a potentially serious problem, how many more people do you need to see experience the problem before you do something about it? Framed this way, the question seems nonsensical because you already know there\u2019s a problem.<\/p>\n<p>Before the party, however, you didn\u2019t know there was a problem.<\/p>\n<p>The question in UX research is rarely, \u201cOnce we\u2019ve seen a problem (now that we know it exists), how many more people do we need to see experiencing the problem?\u201d The question is usually something like: \u201cWe don\u2019t know what the problems are but want to find and fix as many of them as we can. What\u2019s a reasonable number of people to observe to find a reasonable set of problems?\u201d<\/p>\n<p>So, even though the parable is helpful, it\u2019s also deceiving because:<\/p>\n<ol>\n<li>Seeing a problem happen with the first user doesn\u2019t mean that you need to test only one user.<\/li>\n<li>Nor does it mean you should dismiss the value of sample size estimates to guide the process of uncovering problems.<\/li>\n<li>Most usability tests look for multiple issues, not one issue, so it doesn\u2019t make sense to have a stopping rule that ends the test after you\u2019ve seen one participant have one issue.<\/li>\n<\/ol>\n<p>When computing sample sizes, the question is not \u201cHow many people do you need to test once you\u2019ve seen a problem?\u201d The question is \u201cHow many people do you need to observe to see whether unknown problems exist?\u201d<\/p>\n<p>Suppose we change the plot of the parable a bit. There\u2019s no difference in the carpet. It\u2019s still possible that it might trip someone. But in this version, you\u2019ve invited five friends to the party, and as they enter the living room, no one trips on the carpet. You remain blissfully unaware of the potential problem.<\/p>\n<p>If a tree falls in the forest and the first five hikers who cross over it don\u2019t trip, is it a problem?<\/p>\n<p>More generally, if a problem never occurs out of five opportunities, is that compelling evidence that there really isn\u2019t a problem?<\/p>\n<p>It is compelling evidence that the likelihood of tripping isn\u2019t super high. The 95% adjusted-Wald binomial confidence interval for 0\/5 occurrences of a potential problem ranges from 0 to 40%. With the evidence in hand, it\u2019s plausible that the problem likelihood is 0% but it\u2019s also plausible that it\u2019s as high as 40%. This is related to our discussion in <a href=\"https:\/\/measuringu.com\/should-you-report-numbers-with-small-n\/\">a previous article<\/a> that it\u2019s possible with a small sample to prove a problem exists, but it takes a very large sample to provide compelling evidence that a problem does not exist\u2014a much larger sample than those typical of problem discovery studies.<\/p>\n<p>As a UX researcher, you\u2019re probably unconcerned about party planning and carpet hazards, but you\u2019ll want to be sure you\u2019ve found and fixed the usability problems in your products before users arrive.<\/p>\n<p>We recommend doing a small sample usability test, which will uncover many of the more common (frequently occurring) problems. However, usability testing will not uncover <em>all<\/em> problems, certainly not all low-frequency critical problems\u2014those that may happen infrequently but have the potential to cause major issues.<\/p>\n<p>So, how <em>can<\/em> you plan the number of people to observe in a problem discovery usability test?<\/p>\n<p>One of the most useful tools for this kind of planning is a sample size table like Table 1.<\/p>\n<table id=\"tablepress-955\" class=\"tablepress tablepress-id-955\">\n<thead>\n<tr class=\"row-1\">\n<th class=\"column-1\"\/>\n<th colspan=\"8\" class=\"column-2\"><center>Probability of Problem in Studied Population<\/center><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"row-2\">\n<td class=\"column-1\">\u2007<strong><i>n<\/i><\/strong><\/td>\n<td class=\"column-2\">\u2007<strong>1%<\/strong><\/td>\n<td class=\"column-3\">\u2007<strong>5%<\/strong><\/td>\n<td class=\"column-4\"><strong>10%<\/strong><\/td>\n<td class=\"column-5\"><strong>15%<\/strong><\/td>\n<td class=\"column-6\"><strong>25%<\/strong><\/td>\n<td class=\"column-7\"><strong>30%<\/strong><\/td>\n<td class=\"column-8\">\u2007<strong>50%<\/strong><\/td>\n<td class=\"column-9\">\u2007<strong>75%<\/strong><\/td>\n<\/tr>\n<tr class=\"row-3\">\n<td class=\"column-1\">\u20071<\/td>\n<td class=\"column-2\">\u20071%<\/td>\n<td class=\"column-3\">\u20075%<\/td>\n<td class=\"column-4\">10%<\/td>\n<td class=\"column-5\">15%<\/td>\n<td class=\"column-6\">25%<\/td>\n<td class=\"column-7\">30%<\/td>\n<td class=\"column-8\">\u200750%<\/td>\n<td class=\"column-9\">\u200775%<\/td>\n<\/tr>\n<tr class=\"row-4\">\n<td class=\"column-1\">\u20072<\/td>\n<td class=\"column-2\">\u20072%<\/td>\n<td class=\"column-3\">10%<\/td>\n<td class=\"column-4\">19%<\/td>\n<td class=\"column-5\">28%<\/td>\n<td class=\"column-6\">44%<\/td>\n<td class=\"column-7\">51%<\/td>\n<td class=\"column-8\">\u200775%<\/td>\n<td class=\"column-9\">\u200794%<\/td>\n<\/tr>\n<tr class=\"row-5\">\n<td class=\"column-1\">\u20073<\/td>\n<td class=\"column-2\">\u20073%<\/td>\n<td class=\"column-3\">14%<\/td>\n<td class=\"column-4\">27%<\/td>\n<td class=\"column-5\">39%<\/td>\n<td class=\"column-6\">58%<\/td>\n<td class=\"column-7\">66%<\/td>\n<td class=\"column-8\">\u200788%<\/td>\n<td class=\"column-9\">\u200798%<\/td>\n<\/tr>\n<tr class=\"row-6\">\n<td class=\"column-1\">\u20074<\/td>\n<td class=\"column-2\">\u20074%<\/td>\n<td class=\"column-3\">19%<\/td>\n<td class=\"column-4\">34%<\/td>\n<td class=\"column-5\">48%<\/td>\n<td class=\"column-6\">68%<\/td>\n<td class=\"column-7\">76%<\/td>\n<td class=\"column-8\">\u200794%<\/td>\n<td class=\"column-9\">100%<\/td>\n<\/tr>\n<tr class=\"row-7\">\n<td class=\"column-1\">\u20075<\/td>\n<td class=\"column-2\">\u20075%<\/td>\n<td class=\"column-3\">23%<\/td>\n<td class=\"column-4\">41%<\/td>\n<td class=\"column-5\">56%<\/td>\n<td class=\"column-6\">76%<\/td>\n<td class=\"column-7\">83%<\/td>\n<td class=\"column-8\">\u200797%<\/td>\n<td class=\"column-9\">100%<\/td>\n<\/tr>\n<tr class=\"row-8\">\n<td class=\"column-1\">\u20076<\/td>\n<td class=\"column-2\">\u20076%<\/td>\n<td class=\"column-3\">26%<\/td>\n<td class=\"column-4\">47%<\/td>\n<td class=\"column-5\">62%<\/td>\n<td class=\"column-6\">82%<\/td>\n<td class=\"column-7\">88%<\/td>\n<td class=\"column-8\">\u200798%<\/td>\n<td class=\"column-9\">100%<\/td>\n<\/tr>\n<tr class=\"row-9\">\n<td class=\"column-1\">\u20077<\/td>\n<td class=\"column-2\">\u20077%<\/td>\n<td class=\"column-3\">30%<\/td>\n<td class=\"column-4\">52%<\/td>\n<td class=\"column-5\">68%<\/td>\n<td class=\"column-6\">87%<\/td>\n<td class=\"column-7\">92%<\/td>\n<td class=\"column-8\">\u200799%<\/td>\n<td class=\"column-9\">100%<\/td>\n<\/tr>\n<tr class=\"row-10\">\n<td class=\"column-1\">\u20078<\/td>\n<td class=\"column-2\">\u20078%<\/td>\n<td class=\"column-3\">34%<\/td>\n<td class=\"column-4\">57%<\/td>\n<td class=\"column-5\">73%<\/td>\n<td class=\"column-6\">90%<\/td>\n<td class=\"column-7\">94%<\/td>\n<td class=\"column-8\">100%<\/td>\n<td class=\"column-9\">100%<\/td>\n<\/tr>\n<tr class=\"row-11\">\n<td class=\"column-1\">\u20079<\/td>\n<td class=\"column-2\">\u20079%<\/td>\n<td class=\"column-3\">37%<\/td>\n<td class=\"column-4\">61%<\/td>\n<td class=\"column-5\">77%<\/td>\n<td class=\"column-6\">92%<\/td>\n<td class=\"column-7\">96%<\/td>\n<td class=\"column-8\">100%<\/td>\n<td class=\"column-9\">100%<\/td>\n<\/tr>\n<tr class=\"row-12\">\n<td class=\"column-1\">10<\/td>\n<td class=\"column-2\">10%<\/td>\n<td class=\"column-3\">40%<\/td>\n<td class=\"column-4\">65%<\/td>\n<td class=\"column-5\">80%<\/td>\n<td class=\"column-6\">94%<\/td>\n<td class=\"column-7\">97%<\/td>\n<td class=\"column-8\">100%<\/td>\n<td class=\"column-9\">100%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><!-- #tablepress-955 from cache --><\/p>\n<p class=\"wp-caption-text\" style=\"text-align: left;\"><strong>Table 1:<\/strong> Problem discovery rates for sample sizes from 1 to 10 with probabilities of problem occurrence in the studied population from 1% to 75%. (For the full table showing <em>n<\/em> from 1 to 25, see <a href=\"https:\/\/measuringu.com\/specific-sample-sizes-in-problem-discovery-studies\/\">\u201cWhat You Get with Specific Sample Sizes in UX Problem Discovery Studies<\/a>.\u201d)<\/p>\n<p>The table shows that if you run a problem-discovery usability study with five participants, you\u2019d expect to discover (see at least once) almost all the problems that would happen to half or more of the population (within the constraints of the problems that are discoverable in the task set). You\u2019d also expect to discover about 76% of problems that would happen to a quarter of the population and over half the problems that would happen to 15% of the population. The expected discovery rates for problems that would happen to 10%, 5%, and 1% of the population are, respectively, 41%, 23%, and 5%. All these discovery rates improve when the sample size is increased to ten, but even then, the expected discovery rates for 10%, 5%, and 1% of the population are well below 100% (respectively, they are 65%, 40%, and 10%).<\/p>\n<p>If after observing five or ten people you don\u2019t see anything, it doesn\u2019t mean you can guarantee there are NO problems. It just means it\u2019s unlikely there are any common problems (assuming those users and tasks were representative and comprehensive).<\/p>\n<p>Suppose we change the plot of the story again. We\u2019re back at the party, and you watch as your first guest steps on the carpet effortlessly while sipping wine (he tends to be a high stepper). The next guest trips but recovers quickly with no spill. Then comes the fateful moment when the third guest trips on the carpet, spills all the wine on your white couch, and breaks her ankle (and she\u2019s a personal injury lawyer).<\/p>\n<p>From the start of the party, the problem with the carpet was there. The problem was undiscovered with the first guest, discovered with the second guest but with minor impact, and then found again with the third guest with more significant consequences.<\/p>\n<p>You can\u2019t effectively prioritize problems based just on their frequency of occurrence. Of other factors to consider when prioritizing (e.g., cost of fixing), one of the most important is the impact of the problem on the person who experiences it. To further complicate things, different people may experience different impacts for the same underlying problem.<\/p>\n<p>Because the <a href=\"https:\/\/measuringu.com\/specific-sample-sizes-in-discovery-studies\/\">mathematics used to model problem discovery<\/a> is based on frequency, the discovery of a problem is only the first step to fixing it. It may compete with other known problems for limited resources where prioritization is based not only on problem frequency but also on its impact (observed and hypothetical worst cases).<\/p>\n<p>Parables can be powerful.<\/p>\n<p>Traditional parables are usually short stories, often but not exclusively religious, that after reflection, drive home a moral lesson.<\/p>\n<p>It\u2019s also possible for a parable to be a single well-crafted question that provokes deep thought and leads to consideration of a larger truth or principle (e.g., the title of this article).<\/p>\n<p>However, discussion of the meaning of a parable can be affected by its framing\u2014what information contained in or implied by the parable is emphasized or left out.<\/p>\n<p>These framing decisions may be associated with a particular agenda, so it\u2019s important to keep this in mind when thinking critically about a particular presentation and discussion of a parable.<\/p>\n<p>The answer to the carpet parable, as given, seems obvious\u2014one person. But an equally valid answer could be zero people. Even if you never see someone trip on a carpet with a raised edge, as soon as you know there is a potential trip hazard (e.g., you spot the potential problem or someone else tells you about it), you should fix it because, in a worst-case scenario, someone could be injured or even die if it\u2019s left unfixed. Things get even trickier when you move away from the given question and try to apply it to <a href=\"https:\/\/measuringu.com\/three-goals\/\">formative usability testing<\/a>.<\/p>\n<p>The primary purpose of formative usability testing is to set up the conditions (participants, tasks, and environments) that enable the discovery of unknown (or suspected but as yet unobserved) problems when using a product or system.<\/p>\n<p><strong>Bottom line:<\/strong> After reflection, the carpet parable fails to apply to formative usability testing because it\u2019s focused on a single known problem that has the potential for catastrophic consequences rather than the discovery of a set of unknown problems that vary in their likelihood, severity (observed and potential), and priority for fixing.<\/p>\n<\/p><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>You invite your friends over for a gathering at your house. As the party gets started, you watch in horror as a friend trips on the edge of your carpet before she even takes the first sip of her Cabernet (now spilled on your white couch). You rush to fix the carpet. But before you [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":26514,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12033],"tags":[10508,8488,14041,3794,8087],"dealstore":[],"offerexpiration":[],"class_list":["post-26513","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analytics","tag-carpet","tag-fixing","tag-measuringu","tag-people","tag-trip"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How Many People Do You Need to See Trip on Your Carpet Before Fixing It? \u2013 MeasuringU - Som2ny Network<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fivemor.com\/?p=26513\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Many People Do You Need to See Trip on Your Carpet Before Fixing It? \u2013 MeasuringU - Som2ny Network\" \/>\n<meta property=\"og:description\" content=\"You invite your friends over for a gathering at your house. 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