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Lecture 9

Lecture 9. Human Computer Interaction (HCI). What is HCI? Goal of HCI Usability Main Factors Affecting Usability Feedback Affordance Visibility Other HCI Terms Direct Manipulation Mapping Metaphors. Human Computer Interaction - HCI. Disciplines that Contribute to HCI.

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Lecture 9

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  1. Lecture 9

  2. Human Computer Interaction (HCI) • What is HCI? • Goal of HCI • Usability • Main Factors Affecting Usability • Feedback • Affordance • Visibility • Other HCI Terms • Direct Manipulation • Mapping • Metaphors

  3. Human Computer Interaction - HCI

  4. Disciplines that Contribute to HCI

  5. The Goals of HCI To Produce

  6. In order to produce computer system with good usability; Developers must attempt to The long term goal: To design systems that minimize the barrier between the human’s cognitive model of what they want to accomplish and the computer’s understanding of the user’s task

  7. USABILITY

  8. Why is Usability Important

  9. Why Usability is Important? How many systems are easy, effortless, and enjoyable to use?

  10. Why is Usability important? Imagine a photocopier with the following buttons: This symbol is widely used on photocopier, but is of little help to someone unfamiliar with this You put your document into the photocopier, And set the machine to make 15 copies, Then you press the button with “C” to start, What do you think would happen?

  11. Some Problematic Design How fast do I go?

  12. Some Problematic Design Where Does the mouse go?

  13. Main Factors Affecting Usability

  14. Feedback

  15. Feedback

  16. Feedback

  17. Feedback

  18. Feedback

  19. Affordance

  20. Visual Clue of how to interact with an object Affordance • Knobs afford turning • Chairs afford support • Buttons afford pushing • Levers afford moving • Handles afford grasping

  21. Cultural & Learned Affordance Affordance • Scrollbar affords scrolling • Various cursor affords particular operations

  22. Affordance

  23. An important factor for design Perceived Affordance

  24. Visibility

  25. Visibility

  26. Visibility

  27. Other HCI Terms

  28. Metaphor

  29. Metaphor(Visual Metaphor)

  30. Metaphor

  31. Direct Manipulation (Shneiderman 1983)

  32. Mapping

  33. Mapping

  34. DONE  Thank you for listening Any Questions?? • References: • “Human Computer Interaction”, Preece, J. (1994). Addison Weseley. • “Introduction to HCI”, (2004). BELL College, BSc Applied Computing (HCI Notes) http://hamilton.bell.ac.uk/btech/hci/hciintro.pdf • “Guidelines and Standards”, (2004). BELL College, BScAplied Computing (HCI Notes) http://hamilton.bell.ac.uk/btech/hci/hcinotes16.pdf • “Human-Computer Interaction”, 1985, Volume 1, pp. 311-338. Lawrence Erlbaum Associates, Inc.

  35. Research Question  • What are Shneiderman's "Eight Golden Rules of Interface Design”?

  36. Tutorial  • For the following scenarios, map out what you do (USER INPUT) with the way the system seems to operate (SYSTEM FEEDBACK) a. Buying the books “Human Computer Interaction (J. Preece)” and “Shaping Web Usability (A. Badre)” on the internet b. Sending a text message on a mobile phone • Consider factors involved in the design of a new library catalogue system using HCI principles.

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