1. SIE Design Rules
Lecture 5

2. Today’s Schedule Authority vs. Generality
Principles, standards, and guidelines
Importance of the guidelines document
Golden rules
Discussion of reading
Specific design principles:
Learnability
Flexibility
Robustness

3. Design Rules Why give a damn about design rules?
Definition of design rules: creates usable systems by restricting the state space of possibilities.
Goal: Facilitate best practices when making design decisions.

4. Classes and Types of Rules
Two classes of rules:
Authority
Generality
Three types of rules:
Principles - abstract, theory based design rules
Standards - specific design rules
ISO
WAI
Guidelines - suggestive design rules
Human Engineering Data Compendium
World Wide Web Consortium

5. Shneiderman’s 8 Golden Rules
1. Strive for consistency
2. Enable frequent users to use shortcuts
3. Offer informative feedback
4. Design dialogs to yield closure
5. Offer error prevention and simple error handling
6. Permit easy reversal of actions
7. Support internal locus of control
8. Reduce short-term memory load

6. Shneiderman Tree Map

7. Norman’s 7 Principles
1. Use both knowledge in the world and knowledge in the head.
2. Simplify the structure of tasks.
3. Make things visible: bridge the gulfs of execution and evaluation.
4. Get the mappings right.
5. Exploit the power of constraints, both natural and artificial.
6. Design for error.
7. When all else fails, standardize.

8. Summary of principles affecting learnability
Source: Dix et al., Chap 7

9. Warning Panel

10. Summary of principles affecting flexibility
Source: Dix et al., Chap 7

11. Summary of principles affecting robustness
Source: Dix et al., Chap 7

12. 2008 impala

15. Next Class Assignment 5: Task 1: Read Shneiderman Chapter 3.
Task 2: Answer the following questions: What are the most important contributions of the reading? How do these factors relate to good design? Give an example.
Task 3: Identify questions or issues that you would like to talk more about during class/on the participation blog.