01-Usability - Usability of Interactive Systems 1 User...

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1 1 Usability of Interactive Systems 2 User Interfaces ± At an individual level, user interfaces change many people’s lives • Routine processes: online banking and bill payment, tax return preparation, e-prescription • Decision support: doctor’s diagnosis and treatment • Education and training: encyclopedias, drill-and-practice exercises, simulations • Leisure: music and sports information
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2 3 User Interfaces ± The steadily growing interest in user interface design stems from a desire to improve the user experience • Desktop, Web, mobile/handheld, … • Large and small displays • Ubiquitous, pervasive, invisible, embedded, … ± However, there are also many problems with software user interfaces • Complex menus, incomprehensible terminology, chaotic navigation paths, … 4 User Interface Is Important ± User interface strongly affects perception of software • Usable software sells better • Unusable Web sites are abandoned ± Perception is sometimes superficial • Users blame themselves for UI failings • People who make buying decisions are not always end users
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3 5 The Cost of Getting It Wrong ± User’s time isn’t getting cheaper ± Design it correctly now, or pay for it later ± Disasters happen • Therac-25 radiation therapy machine • Aegis radar system of USS Vincennes 6 User Interfaces Are Hard to Design ± You are not the user • Software engineering is mostly about communicating with other programmers • User interface is about communicating with users ± The user is always right • Consistent problems are the system’s fault ± … but the user is not always right • Users are not designers
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4 7 User Interfaces Are Hard to Build ± User interface takes a lot of software development effort ± User interface accounts for ~50% of •De s ign t ime • Implementation time • Maintenance time •Code s i ze 8 What Is HCI? ± Human computer interaction (HCI) is a discipline concerned with the design, evaluation and implementation of interactive computing systems for human use and with the study of the major phenomena surrounding them.
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5 9 What Is HCI? ± HCI combines knowledge and methods associated with professionals including • Psychologists (including experimental, educational, and industrial psychologists) • Computer scientists • Instructional and graphic designers • Technical writers • Human factors and ergonomics experts • Anthropologists and sociologists 10 What’s Next in the Discussion ± Our discussion will focus on the design and development of desktop, Web, and mobile/handheld interfaces for novices, intermittent users, and frequent users • A broad overview of HCI • Guidelines and principles • Development processes •In te ra c t ion s ty le s • Critical design decisions
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6 11 Usability Defined ± “User friendly” • Measures are subjective and vague, so a systematic process is necessary to develop usable systems for specific users in a specific context ± Usability
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This note was uploaded on 02/22/2011 for the course CSE 333 taught by Professor Zao during the Fall '10 term at SUNY Stony Brook.

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01-Usability - Usability of Interactive Systems 1 User...

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