Usability is an important design consideration in software and website design. A designer concerned about usability is concerned about the ability of users to use the software with minimal problems. A more precise explanation is given in the ISO standards, which breaks usability into its components elements:
The ISO 9241 standard describes ergonomic requirements
for office work with visual display terminals. This standard
defines how to specify and measure the usability of products,
and defines the factors which have an effect on usability.
In order to specify or measure usability it is necessary to
identify the goals and to decompose effectiveness, efficiency
and satisfaction and the components of the context of use
into sub components with measurable and verifiable attributes.
(a) Effectiveness is the accuracy and completeness which specified
users can achieve specified goals in particular environments.
(b) Efficiency refers to the resources expended in relation to
the accuracy and completeness of goals achieved.
(c) Satisfaction refers to the comfort and acceptability of the
work system to its users and other people affected by its use.
| Names | Why Famous |
|---|---|
| Nielson | Discount Usability Concept |
| Norman | 1988 User Centered Systems Design |
| Vanderheiden | Promoter of Universal Usability |
| ... | ... |