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IS214: Needs Assessment and Evaluation

IS214: Needs Assessment and Evaluation. Introduction to Usability Assessment. What is usability?. Nielsen:. Usability vs. usefulness. Usability = ease of operation Utility or usefulness = serving intended purpose Both are important. User-Centered Design.

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IS214: Needs Assessment and Evaluation

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  1. IS214: Needs Assessment and Evaluation Introduction to Usability Assessment

  2. What is usability? Nielsen:

  3. Usability vs. usefulness Usability = ease of operation Utility or usefulness = serving intended purpose Both are important.

  4. User-Centered Design • “The practice of designing products so that users can perform required use, operation, service, and supportive tasks with a minimum of stress and maximum of efficiency.” • “Making the design fit the user” not “Making the user fit the design.” --Woodson quoted in Rubin

  5. Principles of User-Centered Design • Set goals • Target market, intended users, competition • Understand users • Design the total customer experience • Evaluate designs • Assess competitiveness • Manage for users: user feedback integral to product plans, priorities, decisions --Vredenberg & others, User-Centered Design

  6. Value of Usability • Validate the business case • Ensure a positive first experience for users • Ensure positive on-going experience – make users’ efforts effective and efficient • Provide a competitive edge • Reduce customer education costs • Avoid cost of redesign late in the cycle • Reduce support costs • Make the world a happier, more productive place

  7. Usability Slogans • Your best guess is not good enough • The user is always right • The user is not always right • Users are not designers • Designers are not users • Vice Presidents are not users • Details matter • Help doesn’t --Nielsen, Usability Engineering

  8. The design/assessment process • My diagram • Kevin McBride’s (IBM) slides

  9. Who is on the Usability Team? --Kevin McBride, IBM • UCD Project Leader • Total User Experience Leader • Visual Designer • User Assistance Architect • Technology Architect (continued…)

  10. Who is on the Usability Team? • Human-Computer Interaction Designer • Marketing Specialist • Service/Support Specialist • Internationalization & Terminology • User Research Specialist

  11. Some Considerations in Choosing Methods • Stage in the design/implementation process • What you already know, need to know • What difference will it make? • Justification needed to make your argument • Resources available • Timeline

  12. Measurement Principles • Validity: measures what it purports to measure • Ecological validity: represents the conditions under which a system will actually be used • Reliability: gives consistent results under consistent conditions • Inter-rate reliability: consistent results across testers

  13. One Way to Classify Methods • Focus: what is being investigated? • User needs vs. system performance • Who does the assessment? • Users (or proxies) vs. experts • Bases • Tasks • Actual (uncontrolled) or experimental (controlled) • Guidelines, standards • Standard or customized • Setting: controlled, unnatural vs. natural

  14. Overview of assessment methods • matrix

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