How can errors be found before surgery begins?

"How can errors be found before surgery begins?"
By Josephine Marcotty and Maura Lerner, Star Tribune, March 18, 2008

Kathleen Harder (Center for Human Factors Systems Research and Design) is cited in this article about the Methodist Hospital surgeon who accidentally removed a healthy kidney from a patient with kidney cancer last week. Harder works with Minnesota hospitals to reduce errors and believes it's possible to design ways to make hospitals better, but cautions against expecting to completely eliminate human error.