Quality management principles: quality planning, quality assurance, quality control and quality improvement.

2. Quality management methods: structured methods and unstructured methods.

Quality management is the foundation of enterprise's survival and development. By discussing the four aspects of quality plan, quality assurance, quality control and quality improvement, we can better understand how enterprises make reasonable plans by using scientific methods and means to ensure product quality and service quality, so as to realize the long-term development goals of enterprises.