Judging whether a given product satisfies the needs and preferences of the intended users.
Representative users use the product to perform representative tasks, thereby revealing the advantages of interaction as well as opportunities for improvement.
During the process of product development, formative usability testing should be performed as soon as possible and frequently.
Summative testing verifies the safety of products from the perspective of interactive design.
The sample size of usability test is, in general, 8-25, and usually 12-15.
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