Reusing existing web resources for e-learning is a very promising and highly promoted idea in the research field of web-based education, especially for intelligent or adaptive systems where the cost of authoring is tremendous. However methodologies and tools are still lacking and feasibility at reasonable cost is a pending issue. In this paper we propose an original approach to reuse learning resources based on knowledge engineering and Semantic Web technologies. The QBLS platform reuses learning resources available on the web and pedagogical ontologies to create a convenient learning system for assignment sessions. QBLS is being used on actual curricula at the EPU engineering school of Sophia Antipolis.