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The definition of usability is sometimes reduced to 'easy to use,' but this over-simplifies the problem and provides little guidance for the user interface designer.
A more precise definition can be used to understand user
requirements, formulate usability goals and decide on
the best techniques for usability evaluations.
An understanding of the five characteristics of usability
– effective, efficient, engaging, error tolerant, easy to
learn – helps guide the user-centered design tasks to the
goal of usable products.
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What Does Usability Mean: Looking Beyond ‘Ease of Use’
http://www.stc.org/confproceed/2001/PDFs/STC48-000084.PDF
Quesenbery, Whitney
STC Proceedings
2001
Abstract: The definition of usability is sometimes reduced to 'easy to use,' but this over-simplifies the problem and provides little guidance for the user interface designer.
A more precise definition can be used to understand user
requirements, formulate usability goals and decide on
the best techniques for usability evaluations.
An understanding of the five characteristics of usability
– effective, efficient, engaging, error tolerant, easy to
learn – helps guide the user-centered design tasks to the
goal of usable products.
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