Expanding on the World Wide Web levels of use as defined on the "Courses on the Web" Web site at Oregon State University, this paper presents a structure which emphasizes K-12 assignments based on Web use while de-emphasizing the glitz of the Web. The educator purposefully designs a Web-based assignment which adheres to the unit objectives and is appropriate to the environment in which it will be used. Therefore, assignments will be varied according to connectivity, accessibility, student skills, and classroom goals and objectives. The "levels of Web use" background allows teachers to begin with tightly focused assignments that make small and appropriate use of online resources, then builds to more complex assignments as they experience success and develop confidence in their ability to use Web resources effectively. A description is provided of each of the following levels of Web use and URLs that exemplify that level of use: (1) informational use of the Web; (2) supplemental use of the Web; (3) dependent use of the Web; and (4) fully developed courses delivered on the Web. Advantages of a context for Web use are then discussed. (AEF)