What is the A3 Method?

The A3 method is a technique developed by Toyota for summarizing problem-solving, analysis, corrective actions, and an action plan in a structured manner on a single sheet of A3-sized paper (420 × 297 mm), often supplemented with visual aids such as charts or sketches.

The A3 structure follows the scientifically proven PDCA cycle (Plan-Do-Check-Act) and encourages the author to think clearly, concisely, and logically. As a result, an A3 is more than just a reporting format: it is a tool for thinking and communication that contributes to shared understanding and continuous improvement within an organization.

At Toyota, A3s are routinely used for problem-solving, progress reporting, and planning activities such as value stream mapping. A key component of the A3 methodology is the dialogue the document fosters between employees and managers. The document guides the thought process, not just the outcome.

Below is an example of a completed A3:

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Would you like to get started with creating A3s and gain a solid understanding of the concept behind them? Then we recommend the book *Managing to Learn *. This book is the definitive guide in Lean it comes to A3 problem-solving. The book is available in our webshop in both Dutch and English.

Not interested in reading a book and looking for much more practical guidance and/or support in creating A3s for your organization? Then we recommend our Lean Green Belt . Everything is focused on ensuring that you successfully complete an A3 project within your organization. In fact, creating an A3 is the most important part of the certification process.