The document discusses scaling classroom participation for humanities courses. It describes how science and math courses keep students engaged at scale through problem sets that provide automatic feedback. It questions how to take a similar approach for humanities classes, noting that multiple choice and essays are limited. The Parlor app is introduced as embedding discussion and lightweight quizzing in course readings to encourage active reading, start conversations, provide self-serve feedback, gauge reactions, measure participation, and promote competition to push students. The app helps teachers build reading lists, highlight insights, quiz students, and see participation metrics.