Issues of quality cost optimization without hampering product quality level are reviewed. Actuality of issues of quality cost differentiation depending on product type and class is outlined. Practical approaches to determining classes in product range are proposed. The results of statistical survey and the results of expert evaluation of quality costs at three enterprises are presented. The reasons of dynamics of quality cost depending on product class are determined. The perspectives of future researches on the dependence of consumer demand on product quality are formulated. 

product quality, quality cost, cost optimization, product classes