This document discusses cooperative learning (CL) and provides details on the STAD model of CL. It contains the following key points: 1. CL involves students learning together in small groups, with group sizes typically ranging from three to six students. Students work cooperatively to master materials and help each other learn. 2. The STAD model of CL consists of five phases: a class presentation by the teacher, dividing students into teams, individual quizzes, and tracking individual improvement scores. 3. STAD involves teachers first presenting lessons to the entire class. Students are then divided into heterogeneous groups to help each other learn the material. Individual quizzes are given and students are recognized based on individual improvement