System Usability Scale Scores and the Frequency of Testing - Amber Callan
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Date: 2013 – 2014

For a year and a half, I spent all of my research time dedicated to the System Usability Scale (SUS). My study examines the difference between the frequencies of administration of the System Usability Scale (SUS) in regards to the resulting scores. Participants worked through two parts. During the first part, participants were given a task for five separate Honda product websites where they navigated through the site until they found a piece of information. Then during the second part, participants voted in fourteen mock voting ballots.

In testing the frequency of administration of the SUS, participants completed the SUS either after each task (one SUS) or after the set of tasks (five or fourteen SUS, respectively). Results of the experiment showed that participants who had taken a singular SUS for each task (64.6) rated the Honda websites as more usable than those who had taken a comprehensive SUS (43.3). In the voting ballot portion, participants showed the same results where an individual SUS (50.0) rated ballots as more usable than a comprehensive SUS (41.0). Therefore when performing tests of usability on products or websites, it may be best to think about the frequency of SUS use and overall scores. This could have future implications on how frequently the SUS in used during experiments.

This research was presented at the Human Factors and Ergonomic Society Texas Regional Meeting (2013) and National Meeting (2014).

Poster for the Texas Regional Meeting

HFES Regional Poster Kortum Callan

Poster for the HFES National Convention

HFES National Poster Kortum Callan V1