Number of Users Recommended for Research Infographic - Hero

Number of Users Recommended for Research

Number of users
recommended for optimal research results

When conducting user research there is an optimal number of users needed based on the type of research, but the knowledge is scattered across the web. NN/g holds much of the information on qualitative and quantitative studies, while SurveyMonkey has an excellent survey sample size calculator. Here is an infographic to make much of this knowledge readily available in a visual format.


Nielsen, Jakob, and Landauer, Thomas K.: "A mathematical model of the finding of usability problems," Proceedings of ACM INTERCHI'93 Conference (Amsterdam, The Netherlands, 24-29 April 1993), pp. 206-213.

Tullis, Tom, and Wood, Larry. (2004) How Many Users Are Enough for a Card-Sorting Study?, Usability Professionals Association (UPA) 2004 Conference, Minneapolis, MN, June 7–11, 2004.

Nielsen, Jakob. “Quantitative Studies: How Many Users to Test?” Nielsen Norman Group, 26 June 2006,

Guest, Greg, et al. “How Many Focus Groups Are Enough? Building an Evidence Base for Nonprobability Sample Sizes.” Sage Journals, vol. 29, no. 1, 28 Apr. 2016, pp. 3–22., doi:

Nielsen, Jakob, and Kara Pernice. How to Conduct Eyetracking Studies. Nielsen Norman Group, 2009, How to Conduct Eyetracking Studies,

“Sample Size Calculator: Understanding Sample Sizes.” SurveyMonkey,

Poster: # of Research Users

(1 customer review)

$ 20.00$ 30.00

Show the non-believers in your life how much impact only five users can have on your product by proudly displaying this semi-glossy, fingerprint resistant poster in your workspace.

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UX without users is x.

Always know the correct sample size for quantitative and qualitative studies with this 10-millimeter thick poster of recommended users for optimal research results. The last three product images are pictures I took after buying the drop-shipped poster to ensure high-quality.

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1 review for Poster: # of Research Users

  1. designjmb (verified owner)

    As a UX Designer, I decided to buy my own product to judge the quality firsthand. For me, shipping was ~$6 over the purchase price, the drop-ship company printed the poster the next day, and it arrived two days after that.

    Like the description says, the poster is semi-glossy and of good quality. My only qualm was the tube it was mailed in, which caused the paper to curl. Otherwise, this poster looks great in my cubicle and it is often a talking piece.

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