International Software Testing Qualifications Board. (2026). 결함 밀도(fault density). ISTQB Glossary. Retrieved October 10, 2026, from https://istqb-glossary.page/kr/%E1%84%80%E1%85%A7%E1%86%AF%E1%84%92%E1%85%A1%E1%86%B7-%E1%84%86%E1%85%B5%E1%86%AF%E1%84%83%E1%85%A9-fault-density/.