The project aims at enhancing secondary students' confidence to take action for people with out-of-hospital cardiac arrest (OHCA) by implementing compression-only Cardiopulmonary Resuscitation (CPR) and automated external defibrillator (AED) training program for them. About 10,800 S2-S4 secondary school students and 60-90 teachers will benefit from the project. The project deliverables include a curriculum for compression-only CPR/AED education, updated and optimized teaching manuals, refined online learning platform and CPR mobile application.