A few years ago, design researcher Jared Spool studied teams to see what effect exposure to customers had on product success. According to the study he published in 2011, teams that met with real customers for at least two hours per team member every six weeks produced superior products.12 In the study, Spool calls this key metric exposure hours, or the number of hours that each member of the team is exposed to customers. This last point is important. Teams that do a lot of research but in which only research specialists participate do not see this improvement in product quality. The second
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