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A substantial communication tool used in distance education is the asynchronous discussion fora. One of the most popular educational techniques used by fora of distance education is the educational technique of working groups which is the eminent technique that may be applied in all stages of a learning circle. This study uses a specific modelling made for Hellenic Open University's fora, refers to a distance education program for computer teachers and studies the most appropriate group size when working groups technique is implemented through an asynchronous discussion forum, both as for participation and also as for the educational effectiveness.