The ISO 9001:2015 standard is a mass management system standard that is widely used around the world to help organizations improve overall performance and ensure customer satisfaction. The standard is based on the mass management principles of ISO 9000, including customer centricity, leadership, employee engagement, process approach, continuous improvement, evidence-based decision-making, and relationship management. Its core content covers managing and enhancing the effectiveness of mass management systems through a process approach and the PDCA Cycle (Plan-Do-Check-Act).