%0 Journal Article %A Keisuke Nakamura and Kiyoshi Akama and Hiroshi Mabuchi %D 2009 %J International Journal of Computer and Information Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 28, 2009 %T Extending E-learning systems based on Clause-Rule model %U https://publications.waset.org/pdf/13786 %V 28 %X E-Learning systems are used by many learners and teachers. The developer is developing the e-Learning system. However, the developer cannot do system construction to satisfy all of users- demands. We discuss a method of constructing e-Learning systems where learners and teachers can design, try to use, and share extending system functions that they want to use; which may be nally added to the system by system managers. %P 1177 - 1183