Explaining one thing a week in a sketch
5 user tests finds 85% problems
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.
Explaining one thing a week in a sketch
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.