What is Quality
A product is a quality product if it is defect free. To the producer, a product is a quality product if it meets or conforms to the statement of requirements that defines the product. This statement is usually shortened to: quality means meets requirements. From a customer’s perspective, quality means “fit for use.”
What is Quality Assurance (QA)
The set of support activities (including facilitation, training, measurement, and analysis) needed to provide adequate confidence that processes are established and continuously improved to produce products that meet specifications and are fit for use.
What is Quality Control (QC)
The process by which product quality is compared with applicable standards, and the action taken when nonconformance is detected. Its focus is defect detection and removal. This is a line function; that is, the performance of these tasks is the responsibility of the people working within the process.
Reference: CSTE CBOK v6.2
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