Attachment_0013_System_Usability_Scale_Overview.pdf

Overview The System Usability Scale (SUS) is based on a ten-item questionnaire, which is used to evaluate system usability. Soldiers will rate the system on a 5 point Likert scale where 1 means “Strongly Disagree” and 5 means “Strongly Agree”.

The below survey utilizes a valid modification (Sauro, pg. 62) of the SUS where all of the questions have a positive tone. This approach is used to maintain consistency within the responses, and avoids potential sources of error due to soldier misinterpretation improving reliability.

The SUS, score is calculated by totaling an individual’s responses, then, the analyst subtracts ten from the sum of each cumulative response, to generate the raw score. The SUS score is the product of the raw score and a factor of 2.5. It must be noted that while SUS score ranges from 0-100, these scaled scores do not represent a percentage, for example, a SUS score of 68 falls within the 50th percentile.

System Usability Scale (SUS)

References Sauro, Jeff, and James R. Lewis. Quantifying the User Experience: Practical Statistics for User Research.

Waltham: Morgan Kaufmann, March 16, 2012.

Strongly Disagree Disagree Neither Agree Strongly

Agree

1. I think that I would like to use this system frequently.

2. I found this system to be uncomplicated.

3. I thought this system was easy to use.

4. I think that I could use this system without the support of a technical person.

5. I found the various functions in this system were well integrated.

6. I thought there was a lot of consistency in this system’s interface(s).

7. I would imagine that most people would learn to use this system very quickly.

8. I found this system to be very intuitive.

9. I felt very confident using this system.

10. I could use this system without having to learn anything new.

Comments:

Attachment 0013- System Usability Scale Overview

Note: This document is for information purposes, and may be used for evaluating performance against PRD requirement 12.7. This scale will not be used for the purposes of determining base contract awardees.