Besides wireframes, prototypes and task maps, personas still remains one of the poster childs of UCD.
“How can designers create experiences that are custom tailored to people who are unlike themselves? As explained in part 1 of this series, an effective way to gain knowledge of, build empathy for and sharpen focus on users is to use a persona. This final part of the series will explain an effective method of creating a persona.”
(Shlomo Goltz a.k.a. @MoGoltz ~ Smashing Magazine)