International Software Testing Qualifications Board. (2026). 3点見積り(three point estimation). ISTQB Glossary. October 19, 2026 に https://istqb-glossary.page/jp/3%E7%82%B9%E8%A6%8B%E7%A9%8D%E3%82%8A-three-point-estimation/ から取得.
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