なぜなぜ分ぶん析せき

noun

why-why analysis; 5 Whys

A problem-solving technique, often used in manufacturing and business, where one repeatedly asks 'why' to drill down to a root cause. Typically associated with Toyota Production System.

• なぜなぜ分ぶん析せきを使つかって、不ふ良りょう品ひんの根こん本ぽん原げん因いんを突つき止とめた。

  We used why-why analysis to identify the root cause of the defective products.