5 user tests finds 85% problems
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Classic rule of thumb from Jakob Nielsen . Probably the most useful corollary is if you can afford 15 tests, tests 5 users 3 times each and iterate the design in between.
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Classic rule of thumb from Jakob Nielsen . Probably the most useful corollary is if you can afford 15 tests, tests 5 users 3 times each and iterate the design in between.