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5 Whys (Personal Size)
¥1,100
5 Whys Refill (30 pages)
- Simple ver. / Complex ver. (15 pages each)
- How-to-use page (JPN/ENG) included
A method that helps you uncover the root cause of a problem by asking “why” five times.
It was developed by Kiichiro Toyoda of Toyota Motor Corporation. It often reveals unexpected insights that lead to effective solutions.