This article documents a lifecycle approach to employing user-centered design, covering both qualitative and quantitative data gathering methods in support of using this approach for product design, usability testing, and market research. The author provides specific case studies of usability studies, focus groups, interviews, ethnographic studies, and web log analysis. The article supplies practical advice and tools for those interested in exploring user-centered design concepts for web-based tools and services in archives, libraries, and museums. (Contains 16 notes and 6 figures.)