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Different approaches to the measurement of usability are reviewed and related to definitions of usability in international standards. It is concluded that reliable measures of overall usability can only be obtained by assessing the effectiveness, efficiency and satisfaction with which representative users carry out representative tasks in representative(More)
The conventional assumption that quality is an attribute of a product is misleading, as the attributes required for quality will depend on how the product is used. Quality of use is therefore defined as the extent to which a product satisfies stated and implied needs when used under stated conditions. Quality of use can be used to measure usability as the(More)
The wild-type beta2-adrenoceptor and a constitutively active mutant of this receptor were C-terminally tagged with luciferase from the sea pansy Renilla reniformis. C-terminal addition of Renilla luciferase did not substantially alter the levels of expression of either form of the receptor, the elevated constitutive activity of the mutant beta2-adrenoceptor(More)
Over the last 15 years, a comprehensive range of international standards has been developed to define the general principles of user centred design and good practice in user interface design. Most of the standards specify general principles rather than the precise details of the interface. The paper briefly describes how standards are created and reviews(More)
We wish to acknowledge the European Commission and FORTH-ICS for sponsoring the second meeting of the International Scientific Forum (ISF) " Towards an Information Society for All " in Crete, Greece (June 15-16, 1998). The present document elaborates on the proposed R&D agenda by identifying Human Computer Interaction (HCI) challenges and clusters of(More)
There is an increasing demand for software that matches real user needs in a working environment. The paper describes the new framework for software product quality developed for ISO/IEC 9126-1: internal quality (static properties of the code), external quality (behaviour of the software when it is executed) and quality in use (the extent to which the(More)
Understanding user requirements is an integral part of information systems design and is critical to the success of interactive systems. However specifying these requirements is not so simple to achieve. This paper describes general methods to support user requirements analysis that can be adapted to a range of situations. Some brief case studies are(More)
This chapter introduces a range of evaluation methods that assist developers in the creation of interactive electronic products, services and environments (eSystems) that are both easy and pleasant to use for the target audience. The target audience might be the broadest range of people, including people with disabilities and older people or it might be a(More)