Nielsen coined the term "Discount Usability Testing" to indicate the design of tests that conserve resources, including funding and time. One example is a reduced number of users who need to participate. He indicates that as few as how many users can find 80% of design issues?

Question

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Nielsen's work in the early 1990s noted that as few as 5 users can find as many as 80% of design issues.

Nielsen Coined the Term "Discount Usability Testing" to Indicate the Design