On in-service training for teachers, it is very important that learners (teachers) can improve their educational practice in school as a result of the training. However, it is difficult to make sure whether learners could do that or not on the customary type of training occasion where learners are gathered once at a certain place. On the other hand, a distance training course seems to be effective and suitable for teachers, since it enable them to keep on a certain period of learning with daily practice of teaching. Thus, in this study, we developed a distance training course for teachers which fulfilled three types of requirements about a theme and assigned work, interactions among participants and course management, in order to make teachers possible to link their learning to the improvement of their practice continuously. In our course, learners were required to make plans for their lesson and put it into practice in school according to the theme assigned by the instructor, and the opportunities and system environments for interactions between a learner and the instructor or other learners were set up in process of learning. It was suggested through the evaluation data collected in two years that the fulfillment of above requirements promoted learning in the course, furthermore, the following conditions were important to effective implementation of this course: the theme and assigned work of the course has both generality applicable to all learners' practice and capability of concretization applicable to each learner's practice, and the course manager makes an effort to stimulate interactions among participants in a corresponding manner to each learning stage in the course and lead to a sense of community among learners by encouraging informal conversations as well as formal ones on BBS.
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