This chapter describes an approach to the development of an adaptive hypermedia Web-based educational system and presents the model of an AHyCo (adaptive hypermedia courseware) system. An adaptive educational system should contain not only the learning environment for students, but also the authoring environment for teachers. A user friendly authoring module should be the integral part of such a system. The authoring of adaptive hypermedia consists of the development of actual hypermedia content (lessons, tests, etc.) together with the definition of the rules for adaptation. The authoring component of an AHyCo system, described inthis chapter, includes both. By utilizing intuitive form-based user interface, it enables teachers from areas other than IT to produce and interconnect complex hypermedia content.