This paper describes how the authors use a mixture of World Wide Web (WWW)-based functionalities and new didactics to teach educational technology students at the University of Twente (Netherlands) about the design of WWW-based learning environments. Topics discussed include: (1) the content of courses about the design of educational WWW environments; (2) strategies for teaching about design guidelines; (3) areas of concern related to teaching about design guidelines; and (4) a preliminary list of guidelines for teaching about design of WWW-based learning materials. Four figures include: the design guidelines used as content for a course in which first-year educational technology students learn about the design of educational WWW sites; an example of study materials relating to a particular design guideline; a typical online exercise; and a part of the results of self-evaluation in which guidelines are used. (DLS)