What is TWI Job Instruction?

TWI Job Instruction (JI) is a structured method for training operators to do a job correctly, safely, and consistently. Developed during World War II, the method uses a four-step process: Prepare the learner, Present the operation, Try out performance, and Follow up. The instructor breaks down each job into Important Steps, Key Points, and Reasons, then teaches it hands-on at the workstation. TWI JI is the foundation for building a workforce that can hold the standard.

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Tennessee MEP · Lean Manufacturing · Workforce Development

TWI Job Instruction for Tennessee Manufacturers

Q: What is a TWI Job Breakdown Sheet?

A Job Breakdown Sheet is the core teaching document in TWI Job Instruction. It breaks a job into three columns: Important Steps (what to do), Key Points (how to do it right, what could go wrong, or tricks that make it easier), and Reasons (why the Key Point matters). The instructor uses this breakdown to teach the job consistently every time, ensuring nothing is missed and the learner understands not just what to do but why.

A proven method for training operators quickly, correctly, and consistently. TWI Job Instruction reduces learning curves, decreases errors, and builds a workforce that can hold the standard — every operator, every shift.

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The Four-Step Method

Every TWI Job Instruction session follows the same four steps — printed on a pocket card that the instructor carries at all times. The method has not changed since 1943 because it works.

The TWI Job Instruction pocket card — carried by every trained instructor.

Prepare the learner

Put the learner at ease. Find out what they already know. Get them interested in learning the job. Place them in the correct position.

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.

Try out performance

Have the learner do the job. Have them explain each Key Point as they do it again. Make sure they understand. Continue until you know they know it.

Follow up

Put them on their own. Designate who to go to for help. Check frequently. Encourage questions. Taper off extra coaching.

The Job Breakdown Sheet

Before teaching a job, the instructor breaks it down into three columns. This is the core document that makes TWI JI work — it forces the instructor to think through exactly what to teach and why.

Important Steps

What to do

A logical segment of the operation that advances the work. Not every motion — just the steps that matter.

Key Points

How to do it right

Anything that could make or break the job, injure the worker, or make the work easier. The knowledge that experienced operators carry in their heads.

Reasons

Why it matters

When learners understand why a Key Point matters, they remember it and follow it. Without the why, shortcuts happen.

TWI also includes Job Methods (JM) and Job Relations (JR). JM teaches workers to improve processes methodically. JR teaches supervisors to handle people problems effectively. Contact Tennessee MEP for more information about the full TWI program.

Common Questions About TWI Job Instruction

Select any question below to expand the answer.

How does Tennessee MEP deliver TWI training?▼

Tennessee MEP delivers TWI Job Instruction training on-site at your facility using the certified 10-hour Train the Trainer format. Your supervisors and experienced operators learn the four-step method, practice job breakdowns, and deliver real training sessions during the course. Tennessee MEP also offers TWI Job Methods and TWI Job Relations programs. Consultants are based across Tennessee in Nashville, Memphis, Knoxville, Chattanooga, Jackson, and Tri-Cities.

How long does TWI training take?▼

The standard TWI Job Instruction Train the Trainer course is 8 hours delivered over 2 sessions of 4 hours each. This format gives participants time to practice between sessions with real jobs from their own work area. Each session builds on the previous one and includes hands-on practice, not just classroom instruction.

What is a TWI Job Breakdown Sheet?▼

A Job Breakdown Sheet breaks a job into three columns: Important Steps (what to do), Key Points (how to do it right, what could go wrong, or tricks that make it easier), and Reasons (why the Key Point matters). The instructor uses this breakdown to teach the job consistently every time, ensuring nothing is missed and the learner understands not just what to do but why.

What results can we expect from TWI?▼

Manufacturers using TWI JI typically see faster operator onboarding, reduced training time by 50% or more, fewer errors and defects from new operators, less scrap and rework during the learning curve, improved safety during training, and a consistent standard that every trainer follows. TWI also builds internal training capability so you are not dependent on a single experienced operator to transfer knowledge.

What does TWI training cost?▼

Cost depends on the number of participants and which TWI programs are included. Tennessee MEP provides an initial consultation at no cost to assess your training needs and recommend the right program. Contact a Tennessee MEP Solutions Consultant for a specific estimate.