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Number of Users

According to Jacob Nielson - a usability expert - testing five users could uncover about 85% of your site's usability problems.

In your effort to minimize usability testing costs, you should try not to use co-workers, or anyone else who has a hand in creating the site, as test subjects. Even using other Web designers could be a big mistake. Their prior experience with the site, the technology and a bias towards pleasing you could easily spoil the test results.

However, it is acceptable - and economical - to use co-workers to run through, but not complete, the usability tests to make sure there are no problems with your test plan.

Types of Users >>>