Sessions give students a chance to compare notes, to discuss important concepts, to develop strategies for studying the subject, and to test themselves.
SI leaders facilitate the sessions.
SI leaders are students themselves prepared to share with you what they have learned over the years about how to study. They know the course content because they previously took the course and are approved by the course instructors for their competence. They'll be in class with you, hearing the same lecture you hear, taking notes, and reading the same assignments you read. They do not lecture. Their job is to help you think about the material you have covered and put it all together into some kind of perspective during the SI sessions.