developerWorks : Usability : The usability world according to Tog
“Effective interfaces are visually apparent and forgiving, instilling in their users a sense of control. Users quickly see the breadth of their options, grasp how to achieve their goals, and do their work.”
“Effective interfaces do not concern the user with the inner workings of the system. Work is carefully and continuously saved, with full option for the user to undo any activity at any time.”
“Effective applications and services perform a maximum of work, while requiring a minimum of information from users.”