Every time you make a product decision you are placing a bet. You will never have complete certainty, but the more you learn the more confidence you will have - Erika Hall
Jacob Nielsen argues that it is best to invite 5 participants in a usability test. This number has the biggest ROI.
In order to prepare your research Michael created a list of questions to discuss with stakeholders. What questions do you ask?
There is and has been a lot of debate about the magical number of five users for usability testing. Jeff explains the discussion from a statistical perspective.