Chapter 10: Usability (TEST 2)

Question 1

What is Usability

Answer 1

The International Organization for Standardization (ISO) defines usability as

“the extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction”

Question 2

Three criteria to judge usability of a product

Answer 2

Effectiveness, Efficiency, and Satisfaction

Question 3

Effectiveness

Answer 3

Accuracy and completeness in regards to users’ specific goals

completed tasks, number of errors, quality of the outcome, recall, spatial accuracy

Question 4

Efficiency

Answer 4

Resources required to achieve users’ goals

Time to complete, mental effort (cognitive load), patterns of usage, number of steps to complete, input rate

Question 5

Satisfaction

Answer 5

Freedom from discomfort and positive attitudes towards the user of the product

surveys, ease of use, perception

Question 6

Steps to creating a usability test

Answer 6

1. Identify Users
2. Identify Task
3. Identify Measures
4. Create Your Environment

Question 7

Factors to consider when Identifying your Task

Answer 7

Can be performed in a reasonable time

Represents typical users’ goals

Needs to be measurable and can be validated

Question 8

Factors in Identifying Measures

Answer 8

Discrete: # of errors
Continuous: time to complete task

Navigate to ____ | # of clicks
Find ___________ | Time in takes

Question 9

What is an interface

Answer 9

A point where two systems, subjects, organizations, etc. meet and interact

The interface is how the user gives commands to the computer/technology and how the computer/technology gives information back to the user

Question 10

Jakob Nielsen’s Ten Usability Heuristics

Answer 10

1. Visibility of System Status - interactive mall map
2. Match between System and Real World -stovetop controls match to each burner
3. User Control and Freedom - emergency exits
4. Consistency and Standards - conventional design is intuitive (check-in desk at the front)
5. Error Prevention - guard rails
6. Recognition rather than Recall - Avoid making users remember
7. Flexibility and Efficiency of Use - Shortcuts hidden from novice users
8. Aesthetic and Minimalist Design - no information is irrelevant
9. Recognize, Diagnose, and Recover from Errors - errors are expressed correctly
10. Help and Documentation - information kiosk

Question 11

My favorite three heuristics

Answer 11

1. Aesthetic and Minimalist Design
2. Flexibility and Efficiency of Use
3. Recognition Rather than Recall