Software Usability Measurement Inventory
The Software Usability Measurement Inventory (SUMI) is a standardized questionnaire used to evaluate users' perceptions of software usability.
“A questionnaire-based usability testing tool that measures and benchmarks user experience.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is Software Usability Measurement Inventory?
SUMI measures factors such as efficiency, effectiveness, satisfaction, and learnability based on structured user feedback.
Standardized survey: Uses validated usability questions.
User focused: Measures perceived usability.
Benchmarking: Results can be compared across products.
Real World Example
A government benefits portal is adding an online application form used by people with different devices, abilities, and assistive technologies.
The feature can pass functional tests while still blocking users who rely on keyboard navigation, screen readers, captions, or sufficient color contrast. Software usability measurement inventory keeps that risk visible.
The tester checks the application path with assistive technology expectations in mind, including labels, focus order, error messages, and completion without a mouse.
The team releases a service that more citizens can actually use because Software usability measurement inventory is treated as a product quality concern, not a cosmetic review.
Practice Questions
Question 1
Which statement BEST describes Software usability measurement inventory in the context of ISTQB terminology?
Question 2
A tester needs to explain Software usability measurement inventory to a non‑technical stakeholder. Which approach is MOST appropriate?
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