Usability testing requires a fairly complete and coherent design artifact to test against. Whether you are testing production software, a clickable prototype, or even a paper prototype, the point of the test is to validate a product design.

• 可用性测试需要在比较完善的设计成品上进行，不管测试对象是生产软件，能够点击的原型，还是纸制原型，测试的关键在于验证某个产品设计。