Paradigms and Principles

1
Paradigms and Principles

• Learn how to build systems by
• repeating historys lessons
• following abstract heuristics

2
Agenda

• Questions
• History of interactive breakthroughs
• Principles of usability
• Part 1 critiques

3
History of interactive breakthroughs

• Book is thematic
• Rheingolds Tools for Thought
• on-line

4
Paradigm shifts

• Networks and time-sharing
• Video display units
• Programming toolkits

5
Paradigm shifts (contd)

• Personal computing
• Windows
• Metaphors

6
Paradigm shifts (contd)

• Direct manipulation
• Language vs. action (agents)
• Hypertext/WWW

7
Paradigm shifts (contd)

• Multi-modality
• CSCW
• Ubiquitous computing

8
The people responsible

• See lecture from last year
• Also see list of Web bios

9
Any other people
10
Principles of Usability

• Paradigms vs. Principles
• Three categories

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Learnability

• predictability
• synthesizability
• familiarity
• generalizability
• consistency

12
Flexibility

• dialog initiative
• multi-threading
• task migratability
• substitutivity
• customizability

13
Robustness

• observability
• recoverability
• responsiveness
• task conformance

14
Examples
15
Part 1 critiques

• Learn from the past