正解: BCorrect: B
決定日誌のように判断と結果を継続的に記録・照合することが、自分の思考の癖を客観的に発見する最も確実な方法です。Keeping a decision journal that records judgments and compares them with outcomes is the most reliable way to discover your thinking patterns objectively.
自分の思考の癖は内省だけでは見えにくく、記憶は事後的に書き換えられます。「そうなると思っていた」と感じる後知恵バイアスのため、記録なしには自分の予測精度を正しく評価できません。決定日誌は Daniel Kahneman が推奨し Michael Mauboussin らが広めた手法で、判断時点の状況・選択肢・根拠・確信度・予想される結果・感情状態を記録し、後で結果と照合します。数十件たまると、「楽観的すぎる」「特定の人物の意見に流されやすい」「締切直前に判断が雑になる」といった個人特有の傾向が見えてきます。Aは静的なラベルで判断の改善に直結せず、Cは癖の放置、Dは他人の偏りは見えても自分の偏りは見えない「バイアスの盲点」そのものです。Thinking habits are hard to see through introspection alone, and memory is rewritten after the fact. Hindsight bias makes us feel we 'knew it all along', so without records we cannot accurately assess our own forecasting accuracy. The decision journal, recommended by Daniel Kahneman and popularized for practitioners by Michael Mauboussin and Shane Parrish, captures the situation, options, reasoning, confidence, expected outcome, and emotional state at the time of a decision, then compares them with what happened. After a few dozen entries, personal patterns emerge, such as chronic optimism, susceptibility to a particular colleague's views, or sloppy judgment near deadlines. Option A yields a static label with no direct link to better decisions. Option C leaves habits unexamined, and Option D is the bias blind spot itself: seeing others' biases while missing your own.
決定日誌は継続が難しく、多くの人が数週間で記録をやめてしまいます。また結果が出るまで時間がかかる判断では照合が忘れられがちです。さらに、記録を見返すときに自分に都合よく解釈する傾向は残るため、記録があっても自己診断が甘くなる可能性があります。Decision journals are hard to sustain, and most people stop within weeks. For decisions whose outcomes take months to appear, the follow-up comparison is easily forgotten. Even with records, the tendency to interpret entries charitably remains, so self-diagnosis can stay lenient despite the data being right there on the page.
記録の形式を五分で書ける最小限のテンプレートにし、月に一件でも継続することを優先します。照合日をカレンダーに登録して忘れを防ぎます。四半期に一度、信頼できる同僚やコーチと記録を一緒に見返し、第三者の目で傾向を指摘してもらうことで自己解釈の甘さを補います。Reduce the format to a five-minute template and prioritize continuity, even at one entry per month. Put follow-up dates in your calendar so comparisons are not forgotten. Once a quarter, review the journal with a trusted colleague or coach so a third party can point out patterns you interpret too kindly on your own.