As the number of World Wide Web sites continues to grow at an explosive rate, the need for design guidelines also increases. Although there are a number of resources that provide guidance on structure and content, few address the motivational aspects of Web sites. The Website Motivational Analysis Checklist (WebMAC) was developed to help diagnose the motivational quality of sites on the World Wide Web. WebMAC is based, in part, on Keller's ARCS Model of Motivational Design, and also incorporates many of the attributes that define the information science concept of "relevance," a critical concept in information retrieval. WebMAC specifies four general motivational criteria of Web sites: (1) Engaging--offers eye-catching visuals, attractive screen layout, humor, varied activities, novelty, and diverse and well-written content; (2) Meaningful--offers a statement of the purpose and importance of the site, accurate and updated information, meaningful examples and analogies, and quick and easy links to other relevant sites; (3) Organized--offers a site overview, summaries of key points, a help interface, and definitions of terms; and (4) Enjoyable for both the extrinsically and intrinsically motivated user--positive feedback on progress, user-controlled external rewards (such as animation), and quick response speed. WebMAC allows the designer or evaluator to assess the motivational quality of each of the four categories and plot a score on a graph, providing quick visual assessment of the site's strengths and weaknesses. The current version of the instrument is included. (Contains 11 references.) (Author/SWC)