| Value | Category |
|---|---|
| 1 | Formal training |
| 2 | Acquired from/trained by parent/relative/friend |
| 3 | Acquired from other person without payment |
| 4 | Apprenticeship |
| 5 | Trained by other person against payment |
| 6 | Learned from observing other people |
| 7 | Learned from observing products/finished work |
| 8 | Other |