Information Technology Reference
In-Depth Information
Strongly
disagree
Strongly
agree
4
1. I think that I would like to
use this system frequently
2. I found the system unnecessarily
1
2
3
4
5
1
complex
1
2
3
4
5
3. I thought the system was easy
to use
1
1
2
3
4
5
4. I think that I would need the
support of a technical person to
4
be able to use this system
1
2
3
4
5
5. I found the various functions in
1
this system were well integrated
1
2
3
4
5
6. I thought there was too much
2
inconsistency in this system
1
2
3
4
5
7. I would imagine that most people
would learn to use this system
very quickly
8. I found the system very
1
1
2
3
4
5
1
cumbersome to use
1
2
3
4
5
9. I felt very confident using the
4
system
1
2
3
4
5
10. I needed to learn a lot of
3
things before I could get going
1
2
3
4
5
with this system
Total = 22
SUS Score = 22 * 2.5 = 55
Figure 6.8 The System Usability Scale, developed by John Brooke at Digital Equipment Corporation and
an example of scoring it.
CALCULATING A SUS SCORE
To calculate a SUS score, first sum the score contributions from each item. Each
item's score contribution will range from 0 to 4. For items 1, 3, 5, 7, and 9, the score
contribution is the scale position minus 1. For items 2, 4, 6, 8, and 10, the contribution
is 5 minus the scale position. Multiply the sum of the scores by 2.5 to obtain the
overall SUS score. Consider the sample data in
Figure 6.8
. The sum of the values, using
these rules, is 22. Multiply that by 2.5 to get the overall SUS score of 55 or, better yet,
download our spreadsheet for calculating SUS scores from
www.MeasuringUX.com
.
The SUS has been made freely available for use in usability studies, both for
research purposes and for industry use. The only prerequisite for its use is that
any published report should acknowledge the source of the measure. Because
it has been so widely used, quite a few studies in the usability literature have
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