Why you only need to test with five users (explained): Measuring Usability
One question I get a lot is, Do you really only need to test with 5 users? There are a lot of strong opinions about the magic number 5 in usability testing and much has been written about it (e.g. see Lewis 2006PDF). As you can imagine there isn't a fixed number of users that will always be the right number (us quantitative folks love to say that) but testing with five users may be all you need for discovering problems in an interface, given some conditions.
very interesting article. the author even included some simulations. Theres some formulas involved in getting that golden number, as much as i don't understand the binomial formula, the simulations got me.
This makes life much simpler.
Read the full article here
Posted
by Eric Liao
Leave a comment...