One topic I have been pondering a lot is optimal class size for distance learning including what would traditionally be a didactic course, and a seminar. this is important for establishing optimal learning as well as faculty workload. This paper, several years old, presents a mixed model assessment and concludes a seminar group should optimally be 13-15. the literature cited from other sources were helpful as well. Sandi
Qiu, M, Hewitt J, Brett, C 2012 Online class size, note reading, note writing and collaborative discourse International Journal of Computer-Supported Collaborative Learning; Sep2012, Vol. 7 Issue 3, p423-442
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