To use the compare products with bad or good to lose to Quantitation of factors that affect the quality of the product will be used in case of disassembly or item cannot be split into pieces.
For comparison with bad or good to waste. To analyze the factors that affect the quality of the product. It is used in cases where the goods can not be disassembled or separate parts.
To compare products with good, bad or good. To analyze the factors affecting the quality of the goods. It uses in the case of goods can not disassemble or as a separate piece.