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Creating User Interfaces

Creating User Interfaces. Usability Rules. Fitts's Law Homework: Choose government site. Prepare to present/discuss in class. Accessibility. U of Alaska mathematics Discussion?. Usability rules. Jakob Nielsen's rules: http://www.useit.com/papers/heuristic/heuristic_list.html

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Creating User Interfaces

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  1. Creating User Interfaces Usability Rules. Fitts's Law Homework: Choose government site. Prepare to present/discuss in class.

  2. Accessibility • U of Alaska • mathematics • Discussion?

  3. Usability rules • Jakob Nielsen's rules: http://www.useit.com/papers/heuristic/heuristic_list.html • Heuristics for mobile phones: http://www.iphoneuxreviews.com/?p=114 • Yours?

  4. Error prevention • I also call this offensive practices. Examples: • pull-down lists of months, days, years, rather than open text. Can also force dates in the future • dulling/fading illegal options • ???

  5. Error recovery • Errors do happen. Make detection early, quick, efficient • catch as many errors as possible each time, not one at a time IF POSSIBLE • Use confirmation screens

  6. New NY voting machines • People mark ballots (fill in the circle) and • feed into optical readers. • Advantage: paper record. • Disadvantages: • no confirmation • whole ballot can be rejected if over-voting (but no clue as to what) • less than private • ?

  7. Adaptability • Provide alternatives for new versus experienced users. Examples: • shortcut keys on many applications • reduced menus (AutoCad example) • ?

  8. Recognition versus recall • Show list of recent and/or most popular choices, changed as user types so user can select. • ?

  9. Fitts's Law Time to get to a place on the screen is dependent on the distance and the precision required. Confirmed by actual testing! T = k log2(D/S + 0.5), k ~ 100 msec. T = time to move the hand to a target D = distance between hand and target S = size of target http://www.usabilityfirst.com/glossary/term_265.txl http://ei.cs.vt.edu/~cs5724/g1/glance.html

  10. Group exercise • http://www.asktog.com/columns/022DesignedToGiveFitts.html

  11. Cautionary note • Skills at using screen, mouse, touch pad, etc. changing, evolving • Skill at typing (regular) text is….degrading? • Discuss

  12. Predictive text • Opinions? What do you generally do? • Some predictive text is adaptive….

  13. Reprise: Stories • People coming into ER complaining of abdominal pain • Researcher did not want natural language • best/satisfactory interface MAY be different than automation of manual method • interface needs to fit the data/problem. • Early IBM multimedia lessons (Ulysses, Columbus, etc.) • Complaints of system too slow, but wasn't it more lack of keywords, descriptions, etc. leading to the wrong video clip. • Case of 'advanced technology' not being as effective as other methodology.

  14. Also: expectations / experiences • What users bring to [your] application is important: • Experiences with other (existing) platforms and applications • Expectations on what [your thing] will be • For example, this should take one mouse click versus • I need to enter considerable amount of complex data. The process can and should be … deliberate, much feedback.

  15. Homework • Find a government site (one of your representatives, healthcare.gov, stimulus?) • Decide on target audiences, typical questions. Try it! Prepare to present.

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