Sarah J. Swierenga, Ph.D., C.P.E., is director of Michigan State University Usability/Accessibility Research and Consulting. She has more than twenty-five years of experience in the scientific study of users in commercial, military, and academic environments. She is a member of the UPA Voting and Usability Project, and an Invited Expert on the W3C WCAG 2.0 Evaluation Methodology Task Force.