One of the challenges faced most often by those of us in the field of usability is finding good data about user behavior quickly, accurately, and, in most cases, cheaply. In an environment where many stakeholders question the return on investment in usability, some in the industry have developed interesting ideas aimed at gathering user data. One such idea is the analysis of server log files to gather information about user behavior. On the surface, it is easy to understand the gravitation towards server logs: They’re supposedly a data source which portrays what people are doing on a site. Server logs supposedly show what people click on, which pages they view, and how they get from page to page.