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What is the spectrum of Usability? What does it cover?

According to the ISO 9241-10 definition, Usability is:

Extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and statisfaction in a specified context of use.

U

sability does not only concentrate on beginners, but also takes the advanced users into account to improve the overall handling of the product for every user. Usability is about usage, task, performance, and task support. Every user should be able to reach his goals easily by using the product in a way that suits him (e.g. simple mouse clicks for beginners or keyboard shortcuts for power users).