User Interface Design User Interface

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					User Interface Design

General principles for user interface design
Many lists of general UI principles have been devised. Most are fairly similar. This list
partly derived from Microsoft’s Windows Interface Guidelines for Software Design.
Note that the items on this list (and other lists) partially overlap.

1. The user should be in control.

2. The user should be able to act directly.

3. The system should behave consistently.

4. The system should be intuitive and self-disclosing.

5. The system should not make undue demands on the user’s memory.

6. The system should provide feedback.

7. The system should forgive user errors.

8. The system should be aesthetically pleasing and satisfying to use

9. The system should adapt to user abilities and limitations.

Analyze the interface for this familiar device

From: Jakob Nielsen's Alertbox, August 25, 2003:

Usability Test Guidelines
Usability is a quality attribute that assesses how easy user interfaces are
to use. The word "usability" also refers to methods for improving ease-of-
use during the design process.

Usability has five quality components:

      Learnability: How easy is it for users to accomplish basic tasks the first time
       they encounter the design?
      Efficiency: Once users have learned the design, how quickly can they
       perform tasks?
      Memorability: When users return to the design after a period of not using it,
       how easily can they reestablish proficiency?
      Errors: How many errors do users make, how severe are these errors, and
       how easily can they recover from the errors?
      Satisfaction: How pleasant is it to use the design?



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