Evaluators measure the usability, efficiency, and effectiveness of the interface based on usability principles, such as the 10 usability heuristics originally defined by Jakob Nielsen in 1994.
Hinnatakse kasutajaliidese kasutatavust, tõhusust ning efektiivsust baseerudes kümnele 1994. aastal Jakob Nielseni poolt defineeritud kasutusmugavuse printsiibile.