The most important standards in the ISO 9000-9004 group of standards are:

• ISO 9000: This standard serves as an introduction to quality management and establishes basic concepts and terminology. It explains the principles of quality management and the benefits of implementing a quality management system.

• ISO 9001: This standard sets the requirements for a quality management system. It is the best-known standard in the group and specifies the requirements organizations must meet to demonstrate their ability to meet customer needs and improve customer satisfaction. ISO 9001 can be applied by organizations of any size and in any industry.

• ISO 9004: This standard provides guidelines for improving the performance of a quality management system. It focuses on the effectiveness, efficiency, and excellence of an organization as a whole. ISO 9004 offers recommendations for strategic direction, resource management, organizational performance evaluation, and continuous improvement.

The standards in the ISO 9000-9004 group of standards are based on the core principles of quality management, such as customer focus, process-oriented approach, employee involvement, and continuous improvement. They help organizations optimize business processes, minimize risks, and increase customer satisfaction.

Organizations can seek ISO 9001 certification by having their quality management system audited by an accredited certification body. ISO 9001 certification demonstrates that the quality management system meets the requirements of the standard and can serve as proof of quality to customers and business partners.