They aren't really categorized (as far as I know). There is a loose categorization on the wiki, but that's by no means rigid.
The question I have for categories is about the outiers, for example, where should Building Designer or Record Keeper go? Should there be a medical skills category? I was thinking the break down would be;
Labor (all the hard labor stuff)
Administrative (things like Record Keeper, Organizer, etc...)
Social (things like Negotiation)
Medical (all medical skills)
Military (all military skills)
But is that too many categories? And what about strange ones like Alchemy, Swimming, etc... Thoughts?
These categories are great, for the others skills that dont fit in it maybe just add a misc category for them? In what order you gonna place them?
1 Labor, 2 millitary, 3 medical, 4 administrative and 5 socials?
Another suggestion, well maybe a lillte bit weird but i thought for the health status adding a kind of stick figure representing the dwarf, maybe like that:
O
_/|\_
|
/ \
- -
When all part is green it mean hes in good shape, and add color to body part when they are missing or bruised etc..
Edit: personally i would put record keeper in administrative, and building designer in a misc category, maybe. Well Palu was kind of right, they kinda already categorized on the game. But using these category from the game would be too much. In game there a category for the engineering skills, maybe add that?
Edit2: If a skill is not activated on a dwarf and have experience on it, is it gonna be shown on the list?