Peer-Led Team Learning 2e is an innovative model in science education. Student-leaders (peers) guide the activities of small groups of students in weekly Workshop meetings. The students work through challenging problems that are designed to be solved cooperatively. The peer leaders are trained to ensure that the students are actively and productively engaged with the material and with the each other. This methodology offers a number of educational opportunities: the supportive format encourages questions and discussions that lead to conceptual understanding; students learn to work in teams and to communicate more effectively; peer leaders learn teaching and group management skills. Designed for students or instructors, this book presents group problems that cover the one- or two-semester general, organic, and biological (GOB) curriculum.