In his book called Peer Learning in Higher Education, David Boud describes peer teaching as when “advanced students…take on a limited instructional role.” Similarly, peer teaching products are built on the idea that the locus of expertise is found in individual students—one student a whiz in math; another the recipient of the highest grade in her comparative literature course. For example, Brainly lets students crowdsource homework help by “[tapping] into the brainpower of thousands of experts worldwide”—in the form of other students. Anyone can ask a question or submit an answer, and answers are moderated by students who are vetted by the company. Knack enables students with skills in a particular subject to earn money by tutoring their peers.
