Hierarchical Petri-nets model for the design of e-learning system

E-learning has become an important topic in these days both in academia and in industry. Our efforts in this paper concentrate on proposing a conceptual framework to help designer to construct e-learning system. The presented framework can conspicuously help the developer to comprehend the collaboration relationship between the learning objects. Then, the concepts of hierarchical learning process net and hierarchical web services net are defined by hierarchical Petri-net. The model is expressive enough to capture the semantics of learning process and their specificities. By using Petri-net verification technology, the model will have desirable properties. This will definitely help designer to design and optimize the e-learning processes.