ABSTRACT
Developers work to create eSystems that are easy and straightforward for people to use. Terms such as user friendly and easy to use o en indicate these characteristics, but the overall technical term for them is usability. e ISO 9241 standard on Ergonomics of Human System Interaction2 (Part 11, 1998) defi nes usability as:
e extent to which a product can be used by specifi ed users to achieve specifi ed goals with eff ectiveness, effi ciency and satisfaction in a specifi ed context of use.
