What are the three main stages of quality management development, and what are their characteristics?

(1) In the traditional quality management stage, products are only guaranteed by inspection or inspection, and products are inspected after production to distinguish qualified products from unqualified products. Qualified products are put on the market and delivered to customers. Unqualified products need to be reworked, repaired, degraded or scrapped.

(2) In the stage of statistical quality management, sampling inspection is carried out by mathematical statistics, and the production process is controlled by quality control chart to prevent product defects.

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(3) The total quality management stage is effective for the whole process of product quality production (product design stage), formation (product manufacturing stage) and realization (product use and after-sales service stage).