The System Usability Score (SUS) is a questionaire that can be used to evaluate a computer system based on the user experience.
Items:
(1) would like to use the system frequently
(2) system unnecessarily complex
(3) system easy to use
(4) need technical support to use the system
(5) various functions well-integrated
(6) too much inconsistency
(7) able to learn very quickly
(8) system very cumbersome to use
(9) felt confident using the system
(10) need to learn a lot before being able to use the system
Responses: strongly agree, agree, neither agree/disagree, disagree, strongly disagee
Scoring:
(1) items 1, 3, 5, 7, 9: from 4 to 0
(2) items 2, 4, 5, 8, 10: from 0 to 4
total score =
= SUM(points for all 10 items)
Interpretation:
• minimum raw score: 0
• maximum raw score: 40
• The raw score is multiple by 2.5 to change range from 0-40 to 0-100.
|
SUS Score
|
Grade
|
Acceptability
|
|
100
|
A+
|
ideal
|
|
90 to 99
|
A
|
very good
|
|
80 to 89
|
B
|
good
|
|
69 to 79
|
C
|
fair
|
|
60 to 68
|
D
|
marginal
|
|
0 to 59
|
F
|
poor
|
