John Gould|Clayton Lewis
Designing for usability: key principles and what designers think
IBM Research - Thomas J. Watson Research Center
article theoretical empirical theoretically describes three principles system design believe must followed produce useful easy use computer system principles early continual focus users empirical measurement usage iterative design whereby system simulated prototype real modified tested modified tested cycle repeated approach contrasted principled design approaches example get right first time reliance design guidelines empirically article presents data show design principles always intuitive designers identifies arguments designers often offer using principlesand answers provides example principles used successfully