Definition
Job Instruction (JI) is a structured four-step method for teaching a person to perform a job. It was developed as part of the Training Within Industry (TWI) program in the United States during World War II to rapidly train unskilled workers for wartime production. The method is systematic: prepare the learner, present the operation, try out performance, and follow up. Each step has specific actions. The method ensures consistent, complete knowledge transfer from trainer to learner.
Japanese Origin
Shigoto no oshiekata (仕事の教え方) means “how to teach a job” — 仕事 (shigoto, job/work), 教え方 (oshiekata, method of teaching). The TWI programs were introduced to Japan during the U.S. occupation (1945-1952) through the Civil Communications Section (CCS) and the Economic and Scientific Section (ESS). Japanese industry — including Toyota — adopted the programs extensively.
History
TWI was created by the U.S. War Manpower Commission in 1940 to address a critical problem: millions of new, inexperienced workers were entering wartime factories and needed to be trained quickly and effectively. The TWI service developed three core programs: Job Instruction (how to teach), Job Methods (how to improve), and Job Relations (how to handle people problems).
After the war, TWI declined in the United States — the wartime urgency was gone and American industry moved in other directions. But in Japan, the programs took root deeply. Toyota adopted TWI methods in the early 1950s as part of the broader postwar effort to improve Japanese industrial capability. The Job Instruction method became integral to Toyota’s approach to training operators on standardized work.
Toyota’s JI application is notable because it connects directly to the company’s standardized work system. The work element sheet — which breaks a job into elements, key points, and reasons — serves as the job breakdown sheet for JI training. The two systems reinforce each other: standardized work defines what to do, and JI defines how to teach it.
Steps/Process
The four steps of Job Instruction:
Step 1 — Prepare the learner:
- Put the learner at ease
- State the job and find out what the learner already knows
- Get the learner interested in learning the job
- Place the learner in the correct position to observe
Step 2 — Present the operation:
- Tell, show, and illustrate one important step at a time
- Stress each key point
- Instruct clearly, completely, and patiently — but no more than the learner can master
- Go through the operation three times: first showing the steps, then the steps with key points, then the steps with key points and reasons
Step 3 — Try out performance:
- Have the learner do the job — correct errors as they occur
- Have the learner explain each key point as they do the job again
- Have the learner explain the reasons as they do the job a third time
- Make sure the learner understands
- Continue until you know the learner knows
Step 4 — Follow up:
- Put the learner on their own and designate who to go to for help
- Check frequently and encourage questions
- Taper off extra coaching and close follow-up as the learner demonstrates competence
The job breakdown sheet is the critical preparation document. Before teaching, the trainer breaks the job into its important steps, identifies the key points for each step (things that could make or break the job, injure the worker, or make the work easier), and notes the reason for each key point.
Common Mistakes
Skipping the job breakdown preparation. Teaching “from memory” without a written breakdown leads to inconsistent training and omitted key points. The job breakdown sheet is not optional — it is what makes the instruction systematic.
Telling without showing. JI requires the trainer to demonstrate the job, not just describe it. Verbal instruction alone does not transfer physical skills or tacit knowledge about how a task should feel, sound, or look when done correctly.
Moving too fast. The method explicitly warns against presenting more than the learner can master at one time. Rushing through the operation to “save time” means the learner does not actually learn, and the time is wasted.
No follow-up. Step 4 is where the training either solidifies or deteriorates. Without follow-up checks, learners drift from the correct method, pick up bad habits from coworkers, or encounter situations they were not prepared for. The trainer’s job is not done after the demonstration.
Confusing JI with general mentoring. JI is a specific, structured method with defined steps. “Show them how to do it” or “have them shadow an experienced operator” is not JI. The structure — particularly the three-pass presentation and the learner teach-back — is what makes JI effective.