The A3 report is one of the many Lean management tools developed as part of the Toyota Production System (TPS).
There isn’t a single inventor of the A3 reporting method. In fact, Isao Kato (former manager at Toyota) describes it as a hybrid between the PDCA cycle and Toyota’s philosophy to make things visible.
There is also a legend that Taiichi Ohno often refused to read further than the first page of any written report. This is why the A3 is a one-page report.
The name A3 comes from the European A3 paper size corresponding to 11-inches by 17-inches or 29.7cm x 42cm.
Depending on whom you talk to, you’ll see slightly different numbers of steps in the A3 method. Here’s how we like to think about it (feel free to use the comments section if you have a different opinion).
1. Background
2. Current situation
3. Target or goal
4. Root-cause analysis
5. Countermeasures
6. Implementation plan
7. Implement
8. Verification
9. Follow up-share the story and update standardized work
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