In any field, certain controversies have a tendency to re-emerge periodically. Sometimes they cause us to revisit issues in ways that stimulate interesting and challenging discussions. Sometimes they direct our attention to simple but overlooked choices that make a critical difference. Other times these controversies are more like zombies; they come back from the dead to devour the brains of the living by misdirecting the otherwise intelligent to irrelevant and trivial questions. A recent controversy to re-emerge in the field of user-centered design is the question of how many users we need to study in order to detect an…
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