Definition
A one-point lesson (OPL) is a single-page document that teaches exactly one thing. It uses simple visuals — photographs, sketches, or diagrams — with minimal text to communicate a specific piece of knowledge: how to perform a quality check, where to apply lubricant, what an abnormal condition looks like versus a normal one, or how to safely operate a specific feature of a machine. The format is designed for brevity (5-10 minutes of teaching time), visual clarity, and creation by the people who do the work — not by training departments.
Japanese Origin
Wan pointo ressun (ワンポイントレッスン) is a direct transliteration of the English “one-point lesson” into Japanese katakana. The concept originated within the TPM (Total Productive Maintenance) framework developed by JIPM (Japan Institute of Plant Maintenance) and became widely adopted across Japanese manufacturing as a practical training tool.
History at Toyota
One-point lessons became widely used in Japanese manufacturing through the TPM movement in the 1970s and 1980s. At Toyota and its suppliers, the format is valued because it solves a practical problem: how to transfer a specific piece of knowledge quickly and accurately at the point of use. Formal training manuals are comprehensive but slow to create and difficult to use at the workstation. One-point lessons are fast to create — a team leader can make one in 15-30 minutes — and immediately useful.
The format is particularly valuable for documenting lessons learned from problems. When a quality issue is discovered and the root cause is identified, a one-point lesson can capture the key learning and be used to train all operators on the affected process within the same shift.
How It Actually Works
A one-point lesson contains:
- Title — the single topic being taught
- Category — typically “basic knowledge,” “improvement case,” or “trouble case”
- Visual — the dominant element: a photo, sketch, or diagram that shows the key point
- Brief text — a few sentences explaining what to do, why it matters, and what to look for
- Good/bad comparison — often shows a correct condition alongside an incorrect one
Three common categories:
- Basic knowledge — fundamental information every operator should know (e.g., “How to read the pressure gauge on Press #4”)
- Improvement case — a change that was made and what operators need to do differently (e.g., “New fixture positioning for Part #2847”)
- Trouble case — a problem that occurred and how to prevent recurrence (e.g., “Burr detection point added after grinding”)
How it is used: The team leader gathers operators for a brief training session — typically during a shift overlap, a scheduled break, or a pre-shift meeting. The one-point lesson is reviewed, the key point is demonstrated at the workstation, and each operator confirms understanding. The lesson is then posted at the workstation for reference.
Common Mistakes
Trying to cover multiple topics on one page. The power of the format is its single focus. A one-point lesson that covers three topics is just a poorly formatted training manual. One topic, one page, one lesson.
Too much text, not enough visual. The visual should be the dominant element — at least 60% of the page. Operators learn faster from seeing a photo of the correct condition than from reading a paragraph describing it.
Creating them only in a training department. One-point lessons should be created by team leaders, operators, and maintenance technicians — the people closest to the work. A training department may format and archive them, but the content must come from the genba.
Not actually training with them. A one-point lesson that is created and filed without being used for training is documentation, not teaching. The lesson only has value when it is actively used to transfer knowledge to people.