Nested knowledge Space Model and Implementation for the Collaborative Learning Environment

For the problem of data' s mismanagement, separated usage of study tools and hard for awareness processing widely existing in the traditional collaborative learning system, the nested knowledge space model is presented in this paper, which includes the concepts of knowledge domain, inclusion relation, correlation relation, quasi-order relation and parallel relation among the knowledge domain,and knowledge space etc. In the collaborative learning system based on this model,the learning materials and study tools are integrated compactly with the user' s learning process and help the learner studying. In addition the data structure and algorithm for this model are described in this article ,the tool developed for the teachers to manage the model is introduced in the end of this paper.