Our article presents a pedagogical scenarios-based web application that allows the automatic generation and development of pedagogical websites. These pedagogical scenarios are represented in the IMS Learning Design standard. Our application is a web portal helping teachers to dynamically generate web course structures, to edit pedagogical content and to administer their courses. In this paper we are describing the methodological framework and the theoretical approaches used in our research project. We will also make a brief presentation of how the structures are automatically generated. Our application uses a knowledge-based system developed in the JESS environment (Java Expert System Shell). The knowledge is represented in XML files, then translated in JESS rules. Finally we are presenting an example of an educational website structure model developed using our tool and we are presenting an IMS LD graphical editor for modifying the course structures as well. (Contains 1 table and 13 figures.)