Quality The degree to which an item or process meets or exceeds the user’s requirements and expectations. Most common industry definition: Conformance to Requirements.
Quality Policy The overall quality intentions and direction of an organization regarding quality as formally expressed by top management.
Quality Management System (QMS) The organizational structure, processes, procedures, and resources needed to implement quality management goals, objectives, and requirements.
Quality Leadership (QL)¹ The Department of the Navy’s definition of QL is based on W. Edwards Deming’s ideas. “The application of quantitative methods and the knowledge of people to assess and improve a) materials and services supplied to the organization, b) all significant processes within the organization, and c) meeting the needs of the end-user, now and in the future.”
Quality Management (QM) That aspect of the overall management function that determines and implements quality policy. Quality management includes strategic planning, allocation of resources, and systematic activities for quality such as quality planning, operations, oversight, and evaluation.
Quality Assurance (QA) Those planned and systematic activities implemented within the quality system that can be demonstrated to provide confidence that a product or service will fulfill requirements for quality.
Quality Control (QC) Those actions that provide a means of control and measure of the characteristics of an item, process, or facility to established requirements (inspection or source surveillance, or both).
¹ Quality Leadership (QL) http://unpan1.un.org/intradoc/groups/public/documents/ASPA/UNPAN002508.pdf