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The basic objectives of quality control are to maintain quality standards in order to ensure customer satisfaction and to reduce the costs associated with the scrapping of defective goods.
Quality control has two different aspects:
Quality of design related to the appropriateness of the product for the customer's purpose. After establishing customer requirements or the customer's insight of quality it is personified in production design and requirement. Quality of conformance related to the extent to which the goods that are produced conform to the condition laid down. This aspect of quality concerns steadiness of the product.
There is a trade off between the costs associated with the maintenance of quality and the costs resulting from failures. Quality control involves the use of resources in the inspection process. To this has to be added the costs of prevention (special investigation in to failure, personnel training, and maintenance) which have to be balanced against the cost of failure (scrap, reworking, sorting rejects, loss of sales, after-sales service, serving complaints, additional operations).However, quality control costs can be reduced by the inspection of variables in the production process. These include the raw materials that go in to the production process, work in progress and the machinery used.
