Abstract: Provided is a product sorting method based on the quantitative evaluation of a potential failure. The product sorting method manufactures a plurality of independent products with a manufacture device. The product sorting method obtains test records for the respective products by testing the products with a test device. The product sorting method determines whether the products are good products or fail products by analyzing the test records with a failure determination device. The product sorting method calculates a quality index which defines the possibility of potential failure of a population comprising the tested products as one value, by analyzing the test records with a quality index calculation device. The product sorting method determines whether to perform a subsequent operation for products which are determined as the good products by analyzing the quality index with a product sorting device.