*** On June 28th, our User Experience Director, Steve Tengler, presented a webinar entitled “User Experience vs. User Interface”. This post features a question asked by an attendee.
QUESTION: What’s an appropriate sample size? How many rounds of customer tests should I do before production?
STEVE: Depends on the product. If it’s a garage door opener, it’s one round, and a fairly small sample size. If it’s something a lot more complicated, like an F16 cockpit, it’s going to require many more rounds and larger sample sizes. Let me give you more of an answer. You’ll always want an early fact-finding exercise, probably 8-10 participants. I recommend using a professional company to help you recruit here. Especially so they can find your desired persona or if you need to do ‘drive-alongs’ like I talked about earlier. You do this early to find out their unfulfilled needs and how they might use your product in the real world.
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