The Cooperative Principle posits four general ways in which a speaker is expected to be cooperative: (1) quantity--make a contribution no more and no less informative than is required; (2) quality--say only that which one both believes and has adequate evidence for; (3) relation--be relevant; and (4) manner--make a contribution easy to understand.…

Regular debating can be an effective way of improving the performance of ESL pupils and of assessing their language-learning propensities. It requires a lot of listening as well as speaking and generally seems to foster confidence in language use. The relationships set up in debating are pupil-pupil rather than pupil-teacher. (CFM)