of the incoming data, only the way the data is stored. Soft business rules define how the data is aggregated or consolidated. They also define how the data is transformed to meet the requirements of the business. Hard business rules は データの意味を変えることのない。例えば … 0, 1 (integer) -> false, true (boolean) みたいな変換 Soft business rules はプロダクトのシステムの ビジネスロジックに関わる重要なデータ変換