Three sources indicated the need for designing a usability study of the Western Michigan University Libraries' Web site: the results of the 2004 LibQUAL+ survey; the completion of the library's new strategic planning document; and suggestions by library customers and library staff. LibQUAL+ findings and customer comments suggested customers desired more independent use of the library site; better and easier electronic access to library resources, allowing customers to search for and find content on their own; and improved online help. A usability analysis was conducted with graduate and undergraduate students. The results from a task-based questionnaire, observations by investigators, and follow-up discussion sessions are presented. Investigators found usability testing alone may not be adequate to gain the qualitative data necessary for ascertaining the site's ease of use and usefulness and that a multipronged approach might be needed when evaluating a library Web site. (Contains 3 tables, 1 figure, and 26 notes.)