CAS is a fundamental IB Diploma requirement that involves students in experiential learning through creativity, activity, and service. It provides a counterbalance to academic studies and promotes skills like cooperation, problem solving, and a healthy lifestyle. Students must complete experiences in creativity, activity, and service that meet criteria like being purposeful, personally challenging, and planned/reviewed/reported on. They must also reflect on how their experiences achieve learning outcomes and complete one CAS project involving investigation, preparation, action, reflection, and demonstrating results. Regular communication and meeting deadlines is important for CAS.