Last Updated：2025/12/05
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When debugging the legacy system, the team kept joking about the ninety-ninety rule as each small fix seemed to uncover ten more hours of work.
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When debugging the legacy system, the team kept joking about the ninety-ninety rule as each small fix seemed to uncover ten more hours of work.
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ninety-ninety rule
Noun
Japanese Meaning
（ソフトウェア工学において）ユーモラスな格言。コード全体の最初の90%は開発時間の最初の90%を費やし、残りの10%のコードが残りの90%の開発時間を要するという現象を示す。
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