Cho, M.-H. and Tobias, S. 2016. Should Instructors Require Discussion in Online Courses? Effects of Online Discussion on Community of Inquiry, Learner Time, Satisfaction, and Achievement. The International Review of Research in Open and Distributed Learning. 17, 2 (Mar. 2016). DOI:https://doi.org/10.19173/irrodl.v17i2.2342.