Usability

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Usability

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Usability

  1. 2. USABILITY Attention to usability doubles desired business metrics Nielsen Norman Group
  2. 3. <ul><li>40% </li></ul>of the time users fail using websites 35% 45% of the implemented features are never used is the success rate of using web-based applications
  3. 4. Assess how easy is to use the UI <ul><li>LEARNABILITY </li></ul><ul><li>EFFICIENCY </li></ul><ul><li>MEMORABILITY </li></ul><ul><li>ERRORS </li></ul><ul><li>SATISFACTION </li></ul>USABILITY COMPONENTS What:
  4. 5. Necessary condition for survival Why: People leave a website if : <ul><li>it is difficult to use </li></ul><ul><li>its homepage fails to state what users can do on the site </li></ul><ul><li>it doesn't answer users' key questions </li></ul><ul><li>information is hard to read </li></ul><ul><li>it is hard to navigate and users get lost </li></ul>
  5. 6. User testing How: User testing is the fastest and easiest method in the usability engineering toolbox Multiple rounds of testing and redesign are required to achieve acceptable user-experience quality It is much cheaper to fix problems discovered early in the project rather than at its end In real projects, not much testing takes place The lack of test-readiness means that testing happens, at best, once per project Single-test projects invariably defer usability testing until the complete design is available Issues Facts
  6. 7. user testing How: <ul><li>meeting room </li></ul><ul><li>laptop/projector running the application </li></ul><ul><li>notepad </li></ul>Requirements: Procedure: <ul><li>Get representative users </li></ul><ul><li>Ask them to perform representative tasks </li></ul><ul><li>Shut up and let the users do the talking </li></ul><ul><li>Write down: </li></ul><ul><ul><li>where they succeed </li></ul></ul><ul><ul><li>where they have difficulties with the UI </li></ul></ul>
  7. 8. <ul><li>It's important to test users individually and let them solve any problems on their own </li></ul><ul><li>To identify a design's most important usability problems, 5 users is typically enough </li></ul><ul><li>Run many small tests and revise the design rather than run a big, expensive study </li></ul><ul><li>Listening to what people say is misleading, you have to watch what they actually do </li></ul><ul><li>The typical user test is 60-90 minutes </li></ul><ul><li>Focus on having the users behave naturally while interacting with the interface </li></ul><ul><li>At the end ask users about their overall satisfaction using the UI </li></ul>user testing How:
  8. 9. Source: http://www.useit.com/alertbox/20000319.html Why You Only Need to Test with 5 Users Found 15 representative users? Use them in 3 tests with 5 users each.
  9. 10. <ul><li>Systematic User Recruiting </li></ul><ul><li>Incentives for Test Participants </li></ul><ul><li>Simplify User Testing </li></ul><ul><li>Just Do It </li></ul>Improving User Testing TM
  10. 11. <ul><li>No kittens were harmed in the making of this presentation </li></ul>Thank you

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