Inspection and testing are performed before, during, and after manufacturing to ensure that the quality level of the product is within acceptable design standards. Each item in the sample is inspected or tested for certain quality characteristics.
Also the operational parts of quality control, which is the most important factor to the survival of any manufacturing company. Quality control directly supports the other factors of cost, productivity, on-time delivery, and market share. Therefore, all quality standards needed to produce the components of a product and perform its assembly must be specified in a manner such that customers’ expectations are met.