ISO 9001-2015 (Quality Management System) ISO 9001 is defined as the internationally recognized standard for Quality Management Systems (QMS). ISO 9001 sets out the criteria for a quality management system. It can be used by any organization, large or small, regardless of its field of activity. ISO 9001 is based on a number of quality management principles including a strong customer focus, the motivation and implication of top management, the process approach and continual improvement. Using ISO 9001 helps ensure that customers get consistent, good-quality products and services, which in turn brings many business benefits.