It is not unusual to find elaborate schemes for compelling and assessing class participation. Although participation can take many forms, in practice it is most synonymous with discussion, which, at its core, is about student engagement. But with what should the students be engaged? When we make class participation a requirement and assess it, students must then produce evidence. But of what? The author examines the intentions behind class participation, considers the means and associated meanings of its implementation, and suggests new ways for professors to think about and justify it, with our productive learning outcomes in mind. (Contains 1 figure and 2 notes.)