This blog post is about an article I read and I want to share with you some of the main points of this article.
That article has a title "Why You Only need to Test with 5 Users" and the writer is Jakob Nelsen.
From the research of Toom Landauer exported the following chart:
From the above chart we can export information:
References:
Nelsen, J. (2000). Why You Only Need to Test with 5 Users. [Internet]. Available at: <https://www.nngroup.com/articles/why-you-only-need-to-test-with-5-users/>. [Accessed on:14/3/2016].
That article has a title "Why You Only need to Test with 5 Users" and the writer is Jakob Nelsen.
From the research of Toom Landauer exported the following chart:
From the above chart we can export information:
- Zero users => gives zero insights
- Single test user => you know 1/3 of all these you need to know
- Second user => you discover same things as from the first user + something new
- Third user => many things that already observed + small amount of new data
- More and more users => you learn less and less
- After fifth user => wasting time by observing the same findings
Also Jakob Nelsen mentioned in his article that
- There is a need for multiple tests in order to achieve usability
- Engineering
- improve the design
- Not only document weaknesses
- After a new design always test again
- Nobody can design the perfect user interface
There are three main points on this article:
- Elaborate usability tests are a waste of resources.
- The best results come from testing no more than 5 users
- and running as many small tests as you can afford
References:
Nelsen, J. (2000). Why You Only Need to Test with 5 Users. [Internet]. Available at: <https://www.nngroup.com/articles/why-you-only-need-to-test-with-5-users/>. [Accessed on:14/3/2016].
