Usability Heuristic

1
Usability Heuristic

• Chapter 2

2
Simple and Natural Dialogue

• Simple as much as possible
• Match with user task
• Easy to learn
• Get User Attention
• Less is more
• Graphic and Colour
• Screen layouts should use the gestalt rules for
  human perception (Jacob Nielsen, 1993)

3
Speak the Users' Language

• Language - depend on user perspective
• Language not be limited to the words but should
  be include nonverbal elements (etc. icon /
  graphic / symbol)
• Standard language (all user can understand)
• Obvious idea is simply to ask the user what
  words and concept they would like to see in the
  interface
• Mapping and Metaphors

4
Minimize User Memory Load

• Computer good remembering
• People Can't remember a lot of thing
• Interface always give guideline (choose,use,
  edit,)
• Generate all task from scratch
• Menus are a typical technology to archive this
  goal

5
Consistency

• Basic usability principles
• Same command, Same action, Same effect
• Screen Design
• Task and Functionality

6
Feedback

• System should continuously inform the user about
  what it is doing and how it is interpreting the
  user's
• Response Time
• System Failure

7
Clearly Marked Exits

• User do not like to feel trapped by the computer
• Give option when user make mistake
• Cancel / Undo Mechanism

8
Shortcuts

• Option for user
• Expert user
• Middle user
• Beginner user
• Jump directly to other functional

9
Good Errors Messages

• Give a good message when user make a mistake
• Message must be
• Clearly Language
• Precise rather than general
• Constructively help the user to solve the problem
• Polite and not intimidate the user
• Do not blame user

10
Prevent Errors

• There are many situations that are know to be
  error prone and system can often be designed to
  avoid putting the user in such situations
• Capture Errors before develop system
• Avoid Modes
• Reconfirm

11
Help and Documentation

• Guideline to use the systems
• Asking Facilities
• Book / References

12
Discussion
13
Discussion
14
Discussion
15
Discussion
16
Discussion
17
Home work

• Find examples of the 10 Heuristic in the Windows
  XP ? (1 Pic for 1 Heu.)
• Example
• Due Date 9 Sept, 2006

Name Shortcuts Command alternative way