This paper reports on the design strategies and technical solutions that the authors have adopted to increase interaction in a World Wide Web-Based Instruction (WBI) system aimed at supporting new didactic approaches to the subjects of urban planning and architecture through the activation of online modules at the university level. Specifically, the developed system allows authorized users to modify the informative hypertext network dynamically. In addition, users can handle and re-elaborate the information published on the Web pages through specific working tools. The paper focuses on these tools from functional and technical points of view. The WBI system and innovative features are described, and strategies adopted in order to implement the system are summarized, including extending the information network, working on the information pages, and controlling the study path. An overview of system architecture and implementation is then provided. (Contains 23 references.) (MES)