Self-service Devices
Part of Retail kiosks and self-service devices
Testing kiosk usability before installation
Test realistic kiosk tasks, access needs, errors and the proposed shop-floor setting before fixing the device in place.
Test the whole shopper task before fixing a kiosk to the shop floor. Give participants a realistic goal, watch where they hesitate or fail, then repeat the task in a mock-up of the proposed location. A screen that works at a desk may be hard to use when height, glare, noise or a queue changes the setting.
Prepare realistic tasks
Write short scenarios with a finish point, such as finding an item, correcting a mistaken choice or obtaining an order confirmation. Avoid instructions that reveal which control to press. Include an exception such as an unavailable item, no search result or failed scan. Ask participants what they think happened and what they would do next.
Use representative data and equipment where possible. If a connection or screen is simulated, record that limitation. A clickable prototype can expose confusing wording; it cannot establish scanner reliability, payment behaviour or the effect of a lost connection.
Observe completion and recovery
Record whether each participant finishes, needs a prompt, recovers from an error and understands the final message. Note the screen and circumstances where a problem occurs. A small usability study can reveal problems but cannot establish a success rate for all shoppers.
Invite people with different relevant access needs, including people who use assistive technology, and make the test setting accessible. For a kiosk, also check approach space, seated reach, viewing angle, controls, audio and privacy at the proposed position. Test the assisted route as well as independent use.
Usability Testing Key Metrics
- Task Completion Rate
- Measure % of users who complete tasks without help
- Error Recovery Rate
- Percentage of users who recover from mistakes independently
- Assistance Required
- Number of times users needed help from staff
- Privacy Compliance
- Confirmed that sessions clear properly between users
Rehearse the location
Mark the kiosk footprint where it would stand. Check whether a shopper can see the starting prompt on approach, whether a queue blocks access, and that staff can respond to a help request without exposing personal details to bystanders. Try the display under expected trading light, with space for a trolley or mobility aid.
If the design uses an inactivity timeout, tell participants how long the session can be inactive before they may lose information. Observe whether they understand the warning and whether they lose work unexpectedly. A shared device also needs to clear the previous shopper's session; test the timeout and privacy requirements together.
Decide what to change
Group findings by task step, cause and consequence. Fix blocked tasks, then retest the changed flow and the exception that exposed the problem. Before installation, record the equipment and layout represented, who participated, what remains untested and who owns each remaining issue.
