Don't repeat yourself
DRY原則
コードの再利用
関係の正規化
KISS原則
関心の分離
トランザクション処理（内部情報の不一致を防ぐための方法論が関連）
YAGNI
重複コード
Abstraction principle (programming)
Code duplication
Code reuse
copy-and-paste programming
Database normalization and Denormalization
Disk mirroring
Redundancy (engineering)
rule of three (computer programming)
Separation of concerns
Single source of truth (SSOT/SPOT)
Structured programming
Two or more, use a for
You aren't gonna need it
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