A3 Problem-Solving
Framework: Lean A3 — one page, left to right, problem to plan
Use for: Working a real problem to its root cause and a tested countermeasure, on a single page that forces clarity
Time required: A few hours of thinking across the cycle. The page itself stays short on purpose
How to use this template
- It is one page for a reason. A3 is named for the paper size, and the constraint is the feature. If it does not fit, you have not distilled the problem enough.
- Go left to right, top to bottom. The early sections define and understand the problem; the later ones propose, test, and plan. Do not jump to countermeasures before the root cause.
- Show the current state with facts, not opinions. A number, a diagram, a measured gap. "It feels slow" is not a current state.
- Solve the root cause, not the symptom. The middle of the page exists to stop you from fixing the most visible thing instead of the thing actually causing the problem.
- The plan is owned and dated, and you come back to it. An A3 with no follow-up section is a nice essay, not problem-solving.
The A3 (one page)
1. Background
Why this problem matters now, and to whom. The business context in two or three sentences.
[ ]
2. Current state
What is happening today, shown with facts and numbers. Where is the waste, the delay, the defect?
[ ]
3. Goal / target state
What "solved" looks like, in measurable terms. From [X] to [Y] by [when].
[ ]
4. Root-cause analysis
Why is the gap happening? Push past the first answer (5 Whys, fishbone). Name the verified root cause, not the symptom.
[ ]
5. Countermeasures
What changes will address the root cause? Not "solutions" but countermeasures, because you will test whether they actually work.
[ ]
6. Plan
| Action | Owner | Due |
|---|---|---|
| [ ] | [ ] | [ ] |
| [ ] | [ ] | [ ] |
7. Follow-up
How and when you will confirm it worked, and what you will do if it did not.
[ ]
A3 is Lean's thinking tool: the discipline of fitting a whole problem — context, root cause, countermeasure, proof — onto one page anyone can follow. If it does not fit, you do not understand it yet. More on Lean thinking and continuous improvement in the Frameworks & Mental Models Guide at biztechprimer.com.