Peer-led Team Learning, (PLTL), is a model of teaching undergraduate science, math, and engineering courses that introduces peer-led workshops as an integral part of a course. Students who have done well in a course (for instance, General Chemistry) are recruited to become peer-leaders. The peer-leaders meet with small groups of six to ten students each week, for one to two hours, to discuss, debate, and engage in problem solving related to the course material.