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On a literal level, A3 refers to a ledger size (11×17) piece of paper. But in the Lean Six Sigma world, it is a tool to help see the thinking behind the problem-solving. Don't mistake A3s as a document to be completed after the problem is solved. It's important to use the A3 while working through the problem.

The Kaizen A3 template is a one-page document that summarizes the problem, the current situation, the target situation, the root causes, the countermeasures, the action plan, and the follow-up of a root cause analysis project.

A3 paper size measurements are 297 mm x 420 mm, 29.7 cm x 42 cm or 11.7 in x 16.5 in.

A problem statement is the first section of the A3 report and it defines the gap between the current and the desired situation. It should be clear, concise, and factual, and avoid jumping to solutions or blaming others. A good problem statement answers the questions: What is the problem? Where is it happening?

A3 problem solving is a Lean approach to reporting issues and presenting ways of addressing them. The simple method, developed by Toyota, bases on documenting a problem, together with its current outcome and a suggested change, on a single sheet of A3 paper (420x297mm), giving it the name.

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A3 problem solving is a Lean approach to reporting issues and presenting ways of addressing them. The simple method, developed by Toyota, bases on documenting a problem, together with its current outcome and a suggested change, on a single sheet of A3 paper (420x297mm), giving it the name.