A3 Problem Solving

Purpose

A3 Problem Solving forces disciplined thinking about a problem by constraining the entire analysis to one sheet of paper. Named after the A3 paper size, it walks the team through a logical sequence from problem understanding to verified countermeasures.

At a glance

How to run

1. Define the problem (15 min) — State the problem clearly in the top-left of the A3. Describe the gap between the current state and the desired state. Use data, not opinions.
2. Understand the current state (15 min) — Map the process, gather metrics, and describe what is actually happening. Go to the Gemba if needed.
3. Root-cause analysis (20 min) — Use 5 Whys or a fishbone diagram. Dig until you reach systemic causes, not symptoms.
4. Define target state (10 min) — Describe what "solved" looks like. Be specific and measurable.
5. Propose countermeasures (15 min) — For each root cause, propose one or more countermeasures. Evaluate feasibility and impact.
6. Action plan (10 min) — Who does what by when. Include check-in dates.
7. Follow-up plan (5 min) — How will you verify the countermeasures worked? What metrics will you track?

Materials needed

• A3 paper template (physical or digital)
• Data on the problem (metrics, charts, process maps)
• Markers or digital drawing tools
• 5-Whys or fishbone diagram template

Pitfalls & common mistakes

• Jumping to solutions — The A3 structure forces you to understand before solving. Do not skip root-cause analysis.
• Problem too vague — "Things are slow" is not a problem statement. Quantify the gap.
• No follow-up — The A3 is not done when countermeasures are proposed; it is done when they are verified.
• Working alone — A3 is a collaborative tool; the best A3s are co-created.

Inclusion & accessibility

• Share the problem data in advance so all participants come prepared.
• Use a digital template that everyone can edit for remote teams.
• Allow written contributions for people who process better in writing.

Variations

• A3 coaching — A mentor reviews the A3 draft with the author, asking questions rather than giving answers.
• Strategy A3 — Apply the format to strategic decisions, not just operational problems.
• PDCA A3 — Explicitly structure the A3 into Plan-Do-Check-Act sections.

When NOT to use this

• For simple problems with obvious solutions — just fix them.
• If the team has no authority to implement countermeasures — escalate first.

Source & further reading

• Shook, J. (2008). *Managing to Learn*. Lean Enterprise Institute.
• Sobek, D. & Smalley, A. (2008). *Understanding A3 Thinking*. CRC Press.