Job Instruction
Job instruction is a standardized method for teaching one person one job. It originated in the 1940s within the Training Within Industry service. A trainer prepares a sheet listing important steps, key points, and reasons. Instruction follows four steps: prepare, present, try out, and follow up. The instructor presents the operation three times. Next, the learner tries out the operation four times. The instructor then conducts follow-up checks at three checkpoints. This method ensures tasks are performed safely, correctly, and consistently.
- Job breakdown sheet
- 4 important steps and 5 key points for fitting the connector to the V-220 valve, each key point with its reason.
- Prepare the learner
- Job instruction is a method for teaching one person one job so they do it safely, correctly and the same way every time; four steps: prepare the learner, present the operation, try out performance, follow up. On the V-220 valve assembly line, the team leader prepares a new operator. The instructor puts the learner at ease, states the job, finds out what he knows, and gets him interested. The learner stands to see the hands clearly.
- Present the operation
- The instructor presents the operation one important step at a time. Work is shown three times. First, the instructor tells and shows only the important steps. Next, the instructor repeats the work and adds each key point. Finally, the instructor repeats the work with steps, key points, and reasons. The instructor presents no more than the learner can master at once. The learner observes the connector enter the keyed fixture without handling parts.
- Job breakdown sheet
- The job breakdown sheet lists 4 important steps and 5 key points with reasons. An important step is a logical segment of the job where something happens to advance the work. A key point is anything that makes or breaks the step, could injure the worker, or makes the work easier; typed safety, quality or technique. The reason explains why the key point matters. The sheet is prepared beforehand to ensure identical training.
- Try out performance
- The learner tries out the performance four times while the instructor watches. First, the learner does the job silently while the instructor corrects errors immediately. Second, the learner executes the job while naming each important step. Third, the learner repeats the job while naming each key point. Fourth, the learner names each reason while working. The instructor continues the trial until the instructor knows the learner knows the job.
- Follow up the work
- The instructor puts the learner on his own and designates who to call. Follow up maintains process stability after direct coaching ends. The instructor checks progress at the end of the first hour. Further checks occur at the end of the shift and the end of the week. Checks then taper off gradually. Scheduled follow-up keeps the five key points alive while the operator builds confidence on the line.
- Leak tester verification
- Every finished valve enters the leak tester at the end of the bench. The key points protect this functional test. Pins must sit inside the guide before the press touches them. The ram closes to 2 mm, requiring clear fingers. The operator holds the press for one second at the stop so the seal seats. The instructor follows the rule: if the learner has not learned, the instructor has not taught.
Key facts
- Origin
- Training Within Industry, United States, 1940s
- Four steps
- Prepare, present, try out, follow up
- Operation presented
- 3 times: steps; key points; reasons
- Operation tried out
- 4 times, the learner naming more each time
- Breakdown on the clipboard
- 4 important steps, 5 key points
- Rule
- If the learner has not learned, the instructor has not taught
By Matthew Savas — Founder of Kaizumi. Reviewed 13 September 2026.
Job instruction is a method for teaching one person one job so they do it safely, correctly and the same way every time. It has four steps: prepare the learner, present the operation, try out performance, follow up. The method transfers manual skills directly at the workstation. It builds consistent habits from the first work repetition. The process relies on direct observation and active physical practice.
What is job instruction?
Job instruction provides a standardized teaching technique for manufacturing tasks. It transfers procedural knowledge from an experienced trainer to a worker. Training takes place at the gemba rather than in a classroom. The method relies on direct, one-on-one personal coaching.
The trainer teaches manual skills in small, manageable pieces. This structure prevents cognitive overload during learning. Instruction follows a strict sequence of telling, showing, and doing. The learner demonstrates the work repeatedly before working alone.
A complete session uses a written job breakdown sheet. Practitioners use the work instruction guide to structure these documents. Teams format sheets using the work instruction builder for consistency. The written document guides the trainer during the instruction session. It ensures that every worker learns the exact same motions.
The job breakdown sheet
The job breakdown sheet is the preparation document for instruction. This sheet divides an operation into three distinct elements. These elements are important steps, key points, and reasons.
An important step is a logical segment of the job where something happens to advance the work. It answers what happens during the cycle. Steps do not list every minor hand movement. Listing too many steps overwhelms the learner during instruction.
A key point is anything that makes or breaks the step, could injure the worker, or makes the work easier. Key points fall into three distinct types: safety, quality, or technique. A safety key point prevents physical injury to the operator. A quality key point prevents defects or assembly errors. A technique key point provides a knack, feel, or special motion.
Every key point must have an explicit reason. The reason explains why the key point matters to the product. Knowing the reason helps the operator remember the key point.
The four steps of instruction
Job instruction follows four standardized steps conducted in order.
Step 1 is to prepare the learner. The instructor puts the learner at ease to reduce anxiety. The instructor states the specific job name clearly. Next, the instructor finds out what the learner already knows. The instructor gets the learner interested in learning the task. Finally, the instructor places the learner where they can see the instructor's hands from the working side. Looking across a workbench reverses the apparent direction of movement.
Step 2 is to present the operation. The instructor tells, shows, and illustrates one important step at a time. The instructor presents the operation three times:
- The instructor states only the important steps.
- The instructor speaks the steps and adds each key point.
- The instructor speaks the steps, key points, and reasons.
The instructor presents no more than the learner can master at once.
Step 3 is to try out performance. The learner does the job four distinct times under direct supervision:
- The learner performs the job silently while the instructor corrects errors as they happen.
- The learner performs the job while naming each important step aloud.
- The learner performs the job while naming each key point aloud.
- The learner performs the job while naming each reason aloud.
Practice continues until the instructor knows the learner knows.
Step 4 is to follow up. The instructor puts the learner on their own to work. The instructor names who to call for help when abnormalities arise. The instructor checks progress at three fixed checkpoints: at the end of the first hour, at the end of the shift, and at the end of the week. The instructor then tapers off coaching as competence stabilizes. Total passes are fixed by the method: three shown, four tried, and three checks.
The instructor rule and accountability
The instructor pocket card carries a binding operating principle: if the learner has not learned, the instructor has not taught.
This rule places total accountability for learning on the instructor. A failure to perform is never blamed on operator aptitude. If a worker misses a key point, the teaching method failed. The instructor may have presented too much information too fast. The breakdown sheet may have omitted an important physical technique. The instructor may have failed to correct an early error during practice.
This rule forces the instructor to evaluate personal delivery. The instructor adjusts the pacing and breakdown until the learner succeeds.
Standard work and the team leader
Standard work is the documented, current best method to execute an operation, defined by takt time, work sequence, and standard work-in-process. Standard work defines how the operation runs across the cell. Job instruction is how a standard gets into a person's hands.
A work instruction or job breakdown is the sheet. Job instruction is the teaching method using that sheet.
A team leader is a floor-level manufacturing role supporting four to six operators by maintaining flow, standard work, and rapid andon response. Team leaders do most of the instructing on the shop floor. Delivering job instruction is part of their daily leader standard work.
When a worker changes workstations, the team leader teaches the standard. When a workstation changes through kaizen, instruction occurs again. Kaizen is a frontline-led continuous improvement methodology that uses small, reversible changes and standard work to achieve cumulative operational gains. Every updated standard requires an updated breakdown sheet. The team leader then teaches the updated sequence to maintain line stability.
Origins in Training Within Industry
Job instruction originated in the United States during World War II. The United States War Manpower Commission ran the Training Within Industry Service from 1940 to 1945. American war plants faced an urgent need to train industrial workers quickly.
The agency developed three supervisory programs, known as the J programs: Job Instruction, Job Methods, and Job Relations. Job Instruction provided the method for rapid, consistent skills training across diverse factories.
After 1945, American advisors carried Training Within Industry programs to Japan. Japanese industrial leaders adopted the training during post-war rebuilding. Toyota integrated Job Instruction into its internal supervisor development courses. The method became part of Toyota's supervisor training.
Example: teaching the connector fit
A job instruction session occurs on the V-220 valve assembly line. The line uses an hourly production board with a plan of 90 valves per hour. This production pace requires a 40-second takt.
The job is fitting the electrical connector to the V-220 valve body. The team leader teaches a new operator during his first week. A bent connector pin was previously a logged problem on the hourly board.
The team reviewed the failure modes on the line's FMEA sheet. The team installed a keyed insertion fixture as the countermeasure. The keyed fixture acts as a poka-yoke mechanism.
The team leader teaches the job after the keyed fixture is installed. The team leader holds a clipboard with the job breakdown sheet. The breakdown sheet contains four important steps and five key points.
- Pick the connector. Key point (quality): pins up, key toward you. Reason: the fixture only accepts the key one way.
- Seat the connector in the fixture. Key point (quality): slide down until it clicks. Reason: pins are inside the guide before the press touches them. Key point (technique): two fingers on the shoulders. Reason: the body stays square; a tilt bends the outer pins.
- Press to the stop. Key point (safety): fingers clear of the ram. Reason: the ram closes to 2 mm. Key point (quality): hold one second at the stop. Reason: the seal seats fully; a short press leaks at test.
- Check and place in the tray. No key point.
Every finished valve goes into the leak tester at the bench end. The key points exist so the valve passes this leak test.
The team leader starts by preparing the learner. The team leader puts the new operator at ease. The operator stands beside the leader on the working side of the bench. This placement ensures that hand motions match the operator's physical perspective.
The team leader presents the operation three times. First, the leader states only the four important steps. Second, the leader repeats the work, speaking the steps and the five key points. Third, the leader speaks the steps, key points, and reasons.
The operator then tries out the operation four times under observation:
- The operator fits the connector silently while the leader watches.
- The operator fits the connector while naming each important step aloud.
- The operator fits the connector while naming each key point aloud.
- The operator fits the connector while naming each reason aloud.
The team leader corrects hand positioning immediately as errors happen during practice. The team leader names who to call when issues arise. The leader checks output at the end of the first hour. The leader checks again at the end of the shift. A final follow-up check occurs at the end of the week.
Frequently asked questions
- What qualifies as a key point on a job breakdown sheet?
- A key point is anything that makes or breaks an important step, could injure the worker, or makes the work easier. Key points fall into three distinct types: safety, quality, or technique. Every key point recorded on the breakdown sheet must include an explicit reason explaining why it matters to the product.
- Why must the learner stand on the working side of the bench during instruction?
- Looking across a workbench reverses the apparent direction of movement and confuses the worker. Placing the learner beside the instructor on the working side lets them see the instructor's hands from the working perspective. This positioning ensures hand motions match what the operator will see when performing the job.
- What is the meaning of the rule that if the learner has not learned, the instructor has not taught?
- This rule places complete accountability for training success on the instructor rather than worker aptitude. If an operator misses a key point or makes an error, the teaching delivery, breakdown sheet, or pacing failed. The instructor must evaluate their personal delivery and adjust the breakdown until the learner performs correctly.
- How does job instruction differ from standard work?
- Standard work is the documented best method to run an operation, defined by takt time, work sequence, and standard work-in-process. Job instruction is the standardized teaching method used to transfer that standard into an operator's hands. Standard work defines cell production requirements, while job instruction builds the physical habits needed to execute them.
- What occurs during each of the four try-out repetitions in step three?
- In the first repetition, the learner does the job silently while the instructor immediately corrects physical errors. In the second repetition, the learner performs the operation while stating each important step aloud. In the third and fourth repetitions, the learner repeats the work while stating each key point and then each reason aloud.
Sources and notes
- Training Within Industry Service, Job Instruction: Sessions Outline and Reference Material (War Manpower Commission, 1944) — The four-step method and the instructor's pocket card
- Patrick Graupp and Robert J. Wrona, The TWI Workbook: Essential Skills for Supervisors (Productivity Press, 2006) — The reasons column on the breakdown sheet and the three-times, four-times pass structure
- Donald A. Dinero, Training Within Industry: The Foundation of Lean (Productivity Press, 2005) — The history of TWI and its three J programs