For UX designers, some of the most exciting projects to work on are new-to-the-world or breakthrough products that solve real problems people didn't even realize they had. Get them right and they may be hugely successful in the marketplace, but they're also the riskiest projects. While user-centered design (UCD) techniques can sometimes be valuable on new-product projects, more often, they don't seem to work particularly well when designing breakthrough products. Here are some lessons I've learned from my own work on new-product projects.