What is SUS?
SUS stands for System Usability Scale, a questionnaire used to evaluate the usability of a system or product. It measures the user’s perception of the system’s ease of use and effectiveness in accomplishing tasks.
How is SUS calculated?
SUS consists of a 10-item questionnaire with a 5-point Likert scale for responses ranging from strongly agree to strongly disagree. The scores are normalized and aggregated to calculate a usability score ranging from 0 to 100.
Examples of SUS in action
- Company A implemented SUS to assess the usability of its new website design. The results indicated an average score of 75, showing good usability.
- Researchers used SUS to compare the usability of two mobile apps for fitness tracking. The app with a higher SUS score was preferred by users.
Benefits of using SUS
- Provides a standardized measure of usability across different systems
- Easy to administer and interpret results
- Helps prioritize design improvements based on user feedback
Case studies on SUS
In a study conducted by Nielsen Norman Group, SUS was used to evaluate the usability of a new software application. The results showed that participants found the system easy to use and gave it a high SUS score. This feedback helped the developers refine the interface and improve the overall user experience.
Conclusion
SUS is a valuable tool for assessing the usability of systems and products. By gathering user feedback through SUS questionnaires, organizations can identify areas for improvement and enhance the overall user experience.
