Cross-training matrix

It is the board with people in rows, stations in columns and each person’s skill level at each station. At a glance it shows who can cover whom during vacation and absences, which stations depend on one person and whom to train. It is also called a skills matrix, versatility chart or ILUO matrix, after the level symbol.

I: the person is in training and only works with someone alongside. L: works under supervision but cannot yet assure standard time or quality. U: works alone, meeting time and quality. O: masters the station and trains others. On this page, qualified means U or O. The circle fills in quarters, as on the boards posted on the shop floor.

The most common rule is 3 per station, to cover vacation, absences and shift changes. A finer estimate multiplies the people the station needs per shift by the number of shifts and by (1 + absenteeism and vacation): 1 person, 2 shifts and 15% gives 2.3, rounded up to 3; 2 people per shift gives 4.6, so 5. High ergonomic-risk stations may get one extra person for rotation.

There are 8 people and 7 stations. With a minimum of 3 qualified (4 at MIG welding and powder coating, which are high-risk), 5 stations are below the minimum. David is the only qualified person at spot welding and is a key person. The multi-skill index is 2.25 stations per person. The plan suggests 7 trainings, 320 h in total, starting with people already at L.

For each station below the minimum it first picks whoever needs the fewest hours to reach U (people already at L), then people with fewer trainings in the plan and fewer stations, without exceeding the per-person limit. It names a level-O person at the station as trainer. It is a heuristic: a good starting point, not necessarily the optimum. Adjust it with the supervisor.

Set each station’s risk from the ergonomic assessment (NIOSH for lifting, RULA for upper limbs, or your job hazard analysis). High-risk stations get one extra person in the minimum, and the page suggests a low-risk station to rotate with, showing who is qualified at both. The rotation interval should come from the assessment itself.

The matrix is only as good as the assessments: each person’s level should be confirmed by observation at the station, for time and quality, and reviewed regularly. The page does not track mandatory training such as lockout/tagout or powered industrial truck certification under OSHA standards, which must be recorded separately. It does not replace staffing or shift scheduling either.