“Because evolutionary products are far more common than revolutionary products, UCD techniques have focused more on how to approach projects for which the problem space is fairly well understood – both by UX designers and by users. UCD techniques are best at helping us determine how to solve such problems – which is not to downplay the challenges of those sorts of projects. However, the situation is different for breakthrough products, where potential users often have difficulty imagining a solution to a problem.” (George Olsen – UXmatters)