The latest BusinessWeek Innovation section features a brief case study on how Norelco/Philips applied user research to better understand the requirements:
Philips interviewed 5,000 men in the U.S., Europe, and China. Its target customer was between the ages of 35 and 54, an experienced shaver who is likely to spend more for a premium razor that will last six to seven years. The company searched for some undiscovered consumer need that might be met with a dynamite product—and found an opportunity in an unlikely place. It learned that one of the most common frustrations of shaving has nothing to do with the face: it's those pesky few flat-lying hairs on the neck under the chin. The men interviewed by the company had to shave over those hairs six or seven times, often irritating their skin and leaving welts or spawning in-grown hairs. Philips decided to develop a razor that closely shaves those neck hairs the first time.