Week 1

Question 1

What is the LEAF criteria

Answer 1

Learnability - users must be able to learn to use the system after a certain amount of training.
Effectiveness - use of a system in a number of environments, within a certain time, and within error limits.
Attitude - positive attitudes towards using the system and levels of tiredness or discomfort are kept to a minimum.
Flexibility - user performance must not degrade beyond a certain limit across tasks and environment.

Question 2

Define Usability

Answer 2

The degree to which something is able or fit to be used.

Question 3

What is system potential?

Answer 3

Achieving optimal performance:
- effectiveness, efficiently, satisfaction.

Question 4

What is reusability?

Answer 4

Level of performance after non use.

Question 5

What makes technology usable? (the 5 E’s)

Answer 5

Effective - the completeness and accuracy with which users achieve specific goals.
Efficient - the speed with accuracy in which users can complete the tasks for which they use the product.
Engaging - how pleasant, satisfying, or interesting the piece is.
Error tolerant - how well the product prevents errors and helps users recover from any errors that do occur.
Easy to learn - concerns how well the product supports both initial orientation and deeper learning.

Question 6

What are some important user issues?

Answer 6

• personality differences
• cultural and environmental diversity
• users with disabilities
• senior citizens and children
• cognitive and perceptual abilities