1. User Interface Design and Evaluation
COMP 6620
User Interface Design and Evaluation

2. What is Usability?

3. What is Usability?
The effectiveness and efficiency of the user interface and the user’s reaction to that interface.

4. What is Usability? Must measure: Easier said than done! Effectiveness
Efficiency
User’s Reaction
Easier said than done!

5. Usability Warnings
Interface designed by software people, not interface people.
It was developed by strict top-down, functional decomposition. (Emphasis on software function)
It was not developed to meet written, measurable usability specifications.

6. Usability Warnings It was not prototyped as it was being developed.
It was not developed by means of an iterative refinement process.
It was not empirically evaluated.

7. Usability Goal Promote communication between humans and computers.
Make this communication doable or easy. (User Friendly)

8. Human Computer Interaction (HCI or CHI)
This is what occurs when a human interacts with a computer or some other machine.

9. HCI Includes Interface hardware and Software Interface Tools
User Modeling
System Modeling

10. HCI Includes Cognitive and Behavioral Science Human Factors
Empirical Studies
Methodology
Techniques and Guidelines

11. Interaction vs. Interface Design

12. Interaction Design Behavioral Domain
Interaction development is the design of the look, feel and input/output responses of the human interface.

13. Interface Design Constructional Domain
Interface development focuses on the software being used to implement the interactions.

14. Interaction and Interface
Interface Design follows Interaction Design.
Both are necessary.
Tendency is to focus on Interface Design, Software Engineers.

15. REMINDER
Complete Reading of Chapter 1