If i want to ask what is the logic behind something does :その中の論理は何ですか Work?

  • そのすじみちは何ですか should work for you
    – A.Ellett
    Oct 19, 2020 at 18:26
  • Do you mean the logic of a machine/system, or the logic of someone's opinion?
    – naruto
    Oct 20, 2020 at 4:00
  • Opinion i guess. More specifically, what's the logic /sense behind a decision someone made
    – Jia
    Oct 20, 2020 at 5:00

2 Answers 2


It depends on context. ・どういう理由ですか? ・どういう理屈ですか?

More polite way 「そのご意見の理由をお伺いできますか?」


If you and the other person are talking about the decision, you can just ask "どうしてそう決まったんですか?" or "どうしてそうなったんですか?"

To be more polite, you can also ask "どうしてその決定になったのか、教えていただけますか?"

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