Was a task difficult or easy to complete? Performance metrics are important to collect when improving usability but perception matters just as much.

Asking a user to respond to a questionnaire immediately after attempting a task provides a simple and reliable way of measuring task-performance satisfaction. Questionnaires administered at the end of a test such as SUS, measure perception satisfaction.

There are numerous questionnaires to gather post-task responses. The SEQ (Single Ease Question) is a new addition.

Usability Questionnaires: If you could only ask one question, use the SEQ (Single Ease Question)