# Use Youtube player (with Youtube AD) #<<<>>> # Use our player (Downlaod, Unblock & No Youtube AD) 再生できないときはここをクリック click here if failed to load 如无法播放请点击这里#

INFO:
Formative usability testing is best done with a small number of study participants, so that you have time and budget to test more design iterations of the user interface.
Usability Testing w. 5 Users: Design Process (video 1 of 3) (Video) - NN/g