Cooperative learning involves intentionally structuring positive interdependence and interaction among students. It is based on social psychology and the work of Johnson and Johnson. When implemented effectively with the five key elements - positive interdependence, individual accountability, face-to-face interaction, teaching social skills, and group processing - it can lead to greater achievement, critical thinking, social skills development, and psychological well-being compared to competitive or individualistic learning. Teachers must carefully plan lessons to incorporate these elements through objectives, tasks, roles, materials, and processing activities.