I rely a lot on discussion boards in this course and use the adjective “substantial” to describe the level of responses students should submit. Since this is a graduate level course, participants’ work should be of graduate level quality. While there is no set number of words that qualifies a “substantial” post, posting a single sentence as a response is probably not “substantial.” As you write, consider Bloom’s Taxonomy and the types of cognitive levels you’re drawing upon. If you’re just describing or restating, you’re not doing much higher level analysis and critique. I’d like to situate our discussions and spend our time in higher forms of thought (application, analysis, evaluation, synthesis).