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Chapter 7 User Interface Design

Chapter 7 User Interface Design. Chapter 16 of textbook. Memory Game. In the following slide you will see a collection of objects. Have a look for 15 seconds. Results. On a piece of paper write down what you remember. How many items did you remember? Average = 7+/-2. How to improve STM.

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Chapter 7 User Interface Design

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  1. Chapter 7User Interface Design Chapter 16 of textbook

  2. Memory Game In the following slide you will see a collection of objects. Have a look for 15 seconds.

  3. Results On a piece of paper write down what you remember. How many items did you remember? Average = 7+/-2

  4. How to improve STM New study finds that short-term memory is improved 20% by walking in nature, or even just by looking at an image of a natural scene.

  5. Human factors in interface design • Limited short-term memory • People can instantaneously remember about 7 items of information. If you present more than this, they are more liable to make mistakes. • People make mistakes • When people make mistakes and systems go wrong, inappropriate alarms and messages can increase stress and hence the likelihood of more mistakes. • People are different • People have a wide range of physical capabilities. Designers should not just design for their own capabilities. • People have different interaction preferences • Some like pictures, some like text.

  6. Class Activity What do you think makes a good interface? Share your thoughts with the rest of the class.

  7. User interface design principles

  8. User Interaction

  9. Sample User Interfaces Have a look at the following user interfaces and try to identify the method of user interaction (how the user provides input to the system).

  10. User interfaces • Pizzatron • Mosquito Basher • Chinese Table • Amazon.com • Windows prompt • Firefox Ubiquity

  11. Interaction styles • Direct manipulation • Menu selection • Form fill-in • Command language • Natural language What do you think are the advantages and disadvantages of each method?

  12. Interaction styles

  13. Web-based interfaces What user interaction elements might you see on a web-based interface? Have a look at the following video and make a list of interface options. Expedi.com

  14. Information presentation

  15. Information presentation

  16. Information display factors • Is the user interested in precise information or data relationships? • How quickly do information values change? Must the change be indicated immediately? • Must the user take some action in response to a change? • Is there a direct manipulation interface? • Is the information textual or numeric? Are relative values important?

  17. Alternative information presentations

  18. Presentation methods

  19. Displaying relative values

  20. Data visualisation • Concerned with techniques for displaying large amounts of information. • Visualisation can reveal relationships between entities and trends in the data.

  21. Example data visualizations • The ksu-it website (hyper linking) • What do the colors mean?blue: for links (the A tag)red: for tables (TABLE, TR and TD tags)green: for the DIV tagviolet: for images (the IMG tag)yellow: for forms (FORM, INPUT, TEXTAREA, SELECT and OPTION tags)orange: for linebreaks and blockquotes (BR, P, and BLOCKQUOTE tags)black: the HTML tag, the root nodegray: all other tags • GapMinder Trendalyzer • Google Earth

  22. Data visualization -resources • Gapminder http://www.gapminder.org • Web pages as graph http://www.aharef.info/static/htmlgraph/ • CrazyEgg http://crazyegg.com/ • Time magazine http://www.time.com/time/covers/20061030/where_we_live/

  23. Color

  24. What’s your verdict?

  25. Colour displays • Colour adds an extra dimension to an interface and can help the user understand complex information structures. • Colour can be used to highlight exceptional events. • Common mistakes in the use of colour in interface design is the over-use of colour in the display.

  26. Colour use guidelines • Limit the number of colours used and be conservative in their use. • Use colour change to show a change in system status. • Use colour coding to support the task that users are trying to perform. • Use colour coding in a thoughtful and consistent way. • Be careful about colour pairings.

  27. More about color • Colour Matters • http://www.colormatters.com/ • Colour combinations: • http://www.webdevelopersnotes.com/design/color_combinations.php3

  28. Error Messages Watch the following clip and comment on the error message displayed. The video clip shows a staff member trying to change the password

  29. Error messages • What do you think error messages should look like (wording)? • What factors are necessary for considering when writing error messages?

  30. Design factors in message wording

  31. User error • Assume that a nurse misspells the name of a patient whose records he is trying to retrieve.

  32. Good and bad message design

  33. References • Nature Walk improves short term memory • http://www.spring.org.uk/2009/01/memory-improved-20-by-nature-walk.php • An example of a bad interface • http://www.angelfire.com/super/badwebs/

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