A skill matrix is a table of operators against operations, showing who can do what and at what level. In a sewing line, it answers questions the supervisor faces every morning: who can replace an absent operator, who should take the bottleneck operation, and who needs training.
Basic layout#
| Operator | Shoulder join (OL) | Neck rib (OL) | Topstitch (FL) | Sleeve attach (OL) | Hem (FL) | Label (LS) |
|---|---|---|---|---|---|---|
| Operator 1 | A | B | A | |||
| Operator 2 | B | A | C | |||
| Operator 3 | A | A | B | |||
| Operator 4 | C | B | B | A |
OL = overlock, FL = flatlock or coverstitch, LS = lockstitch. Blank = not trained.
Grading skills#
Use measured efficiency on each operation, not opinion. One common scheme:
| Grade | Meaning | Operation efficiency (example) |
|---|---|---|
| A | Fully skilled; can train others | 80% or more |
| B | Skilled | 60% to 79% |
| C | Can do the operation with support | 40% to 59% |
| T | In training | Below 40% |
The bands are examples. Set bands that fit your factory's performance levels, and include quality: an operator who is fast but produces many defects should not be graded A.
Some factories use a numeric scale instead, such as 0 (not trained) to 4 (can train others). The downloadable skill matrix template uses that 0 to 4 scale; either works if everyone uses the same definitions.
Operator efficiency on an operation is:
Using the matrix#
Line balancing#
Give the operations with the most work content, and the bottleneck, to A-grade operators. See line balancing.
Covering absenteeism#
When someone is absent, the matrix shows who can move into that position with the least loss.
Planning training#
Look for operations with only one or two skilled operators. Those are risk points. Train more operators to at least B grade on them.
New styles#
When a new style needs operations the line has not done before, the matrix shows who has related skills.
Multi-skilling#
Operators who can do several operations make a line more flexible. A practical target is for each operator to be skilled on at least two or three operations, and for each operation to have at least two or three skilled operators. Build multi-skilling during quieter periods and through planned rotation, not during a rush order.
Keeping it current#
- Update grades monthly, or when an operator completes training.
- Store efficiency data by operator and operation from production records.
- Display the matrix at the line so supervisors can use it.
The operator skill matrix template is ready to fill in.
Worked example: covering an absence#
On a Monday morning, the operator on neck rib attach (the bottleneck operation, SMV 0.45) is absent. The skill matrix shows:
| Operator | Neck rib attach grade | Current operation |
|---|---|---|
| Operator 2 | A (82%) | Shoulder join, not a bottleneck |
| Operator 4 | C (48%) | Label attach |
| Operator 7 | B (66%) | Sleeve attach, near bottleneck |
Moving operator 2 to neck rib attach keeps the bottleneck at high efficiency. Shoulder join has spare capacity, so a B-grade operator or a helper can cover it. Moving operator 7 would create a new bottleneck at sleeve attach. Without the matrix, the supervisor would probably move whoever is closest.
At 82% efficiency, operator 2 produces 60 / 0.45 × 0.82 = 109 pieces per hour on neck rib attach. Operator 4 at 48% would produce 64 pieces per hour and pull the whole line down.
Related guides#
- Bottleneck analysis: placing your strongest operators at the constraint.
- Low line efficiency: skills as one of the causes of low efficiency.
- Kaizen: building skills through continuous improvement.
- Inline inspection: using quality results in skill grades.
- Motion study: training operators on standard methods.
Frequently asked questions#
Should quality be part of the grade? Yes. Record DHU or rework rate by operator and operation, and do not grade an operator A if their defect rate is high.
How long does it take to move an operator up a grade? It depends on the operation and the person. Track efficiency weekly during training, so progress is visible and training can be adjusted.
Should operators see the matrix? Many factories display it at the line. It shows operators where they can develop and supports fair allocation of work.