机械系统现行的四项质量指标:成品抽查合格率、品种一等品率、产品质量稳定提高率和优质产品产值率存在着不能全面地、科学地反映产品质量现状的问题。为此,机电部组织有关部门进行了专题研究,提出了四项新质量指标:产品质量等级系数、质量损失率、产品销售率和质量指数。1991年初通过 The current four quality indicators of the mechanical system: the qualified rate of finished product spot checks, the first-class product rate, the steady increase rate of product quality, and the production value rate of high-quality products cannot solve the problem of comprehensively and scientifically reflecting the current status of product quality. To this end, the Department of Mechanical and Electrical Organization organized relevant departments to conduct a special study and put forward four new quality indicators: product quality rating coefficient, quality loss rate, product sales rate and quality index. Passed in early 1991