A usability test requires less fidelity than a user acceptance test. Testing paper prototypes or simple click-through mockups is done regularly in UT.

Skipping User Acceptance Testing is a recipe for failure. It’s not enough for a system to function in theory, it must work for real people, in real jobs, under real conditions.

User acceptance testing, meanwhile, is the final testing that occurs after functional, system and regression testing has been undertaken. Its aim is to validate the software against the business ...