(Oppermann and Reiterer, 1997)
Defines usability as:
“the extent to which a product can be
used by specified users to achieve specified goals with effectiveness,
efficiency and satisfaction in a specified context of use.”
Requires a practical and comprehensive method of application
ISO standards based on empirical research
Interpretation of them always constrained by technology/costs
Some standards must be enforced by law (Health &
Safety for VDT users)