Abstract
Publisher Summary This chapter discusses the distinction between broad and narrow approaches to usability and identifies the broad approach to usability with the higher level quality objective of quality of use. It is suggested that quality of use should be the major design objective for an interactive product. This relates usability to business objectives and elevates usability from an optional extra to the prime design goal. The narrow approach is complementary and is concerned with the design of features of the product that are a pre-requisite for quality of use. The two different interpretations of usability lead to two approaches to the specification and evaluation of usability. The chapter describes that user-based evaluation can be used to validate achievement of these requirements. Usability attributes provide a contribution to achieving quality of use. The presence or absence of these attributes can be verified early in design. In addition, frequent user-based evaluation of early mock-ups and prototypes is required to give feedback on the quality of use of potential solutions.
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