I'm researching on the relation between stats and skills, that is, what stats makes a skill? Earlier this info was available on a web page, but the owner became cre and removed it, so i decided to take up the good work.
I have not yet finished this off, there are skills I have not covered up yet. In those cases I will give a general description of what's the most important stats.
You will also see "no:Str" or "no:Dex/Wis". This mean that my research shows that stat is not included in that skill, but I don't know all of that skill.
If you see something like Con without any figure after, it means I know the stat is there, but not for how much.

I've colour coded the stats for pedagogic reasons as follows:
Con Dex Str Wis Int

I need some skills to be confirmed here but the major part is clear now.
covert..............
| stealth...........
| | inside..........Dex 5/5
| | outside.........Dex 5/5
| | underwater......Dex No:Int
| hiding............
| | person.......... Dex 4/5 Int 1/5
| | object..........Dex 4/5Int 1/5
| lockpick..........
| | doors...........Dex 3/5Int 2/5
| | safes...........DexInt
| | traps...........Dex 3/5Int 2/5
| manipulation......
| | palming.........Dex 5/5
| | passing.........Dex 5/5
| | sleight-of-hand.Dex 5/5
| | stealing........Dex 5/5
| casing............
| | person..........Dex 2/5Int 3/5
| | place...........DexInt
| items.............
| | poisons.........Dex 3/5Int 2/5
| | traps...........Dex 3/5Int 2/5
| | weapons.........Dex 3/5Int 2/5
| points............Dex 3/5Int 1/5 Wis 1/5

As you can see, there are Dex and Int in all skills, but I do only have 3 skills totaly covered. Str in blacksmithing.
crafts..............
| smithing..........
| | gold............Dex2/5 Int 2/5Wis1/5
| | silver..........DexInt
| | black...........
| | | tools.........DexInt
| | | weapons.......DexInt
| | | armour........DexInt
| carpentry.........
| | furniture.......DexInt
| | coopering.......DexInt
| | turning.........Dex 2/5Int 2/5Wis 1/5
| | whittling.......Dex 2/5Int 2/5Wis 1/5
| pottery...........
| | forming.........
| | | throwing......DexInt
| | | shaping.......DexInt
| | glazing.........DexInt
| | firing..........DexInt
| materials.........
| | tanning.........DexInt WisNo:str,con
| | weaving.........DexInt WisNo:str,con
| | spinning........DexInt WisNo:str,con
| points............DexInt Wis No:str,con

faith...............
| rituals...........
| | offensive.......
| | | area..........Wis 5/5
| | | target........Wis 5/5
| | defensive.......
| | | area..........Wis 5/5
| | | self..........Wis 5/5
| | | target........Wis 5/5
| | curing..........
| | | self..........Wis 5/5
| | | target........Wis 5/5
| | misc............
| | | area..........Wis 5/5
| | | self..........Wis 5/5
| | | target........Wis 5/5
| | special.........Wis 5/5
| items.............
| | rod.............Wis 3/5 Int 2/5
| | scroll..........Wis 3/5 Int 2/5
| points............Wis 5/5

I still have to work to get fi.sp.ta.
fighting............
| combat............
| | melee...........
| | | sharp.........Dex 2/5Str 3/5
| | | pierce........Dex 2/5Str 3/5
| | | blunt.........Dex 2/5Str 3/5
| | | unarmed.......Dex 2/5Str 3/5
| | range...........
| | | thrown........Dex 3/5Str 2/5
| | | fired.........Dex 2/5 Str 2/5 Int 1/5
| | parry...........
| | | melee.........Dex 2/5Str 3/5
| | | range.........Dex 2/5Str 3/5
| | dodging.........
| | | melee.........Dex 4/5Int 1/5
| | | range.........Dex 4/5Int 1/5
| | special.........
| | | weapon........Dex 2/5Int 1/5Str 2/5
| | | unarmed.......Dex 2/5Int 1/5Str 2/5
| | | tactics.......Int No:Dex
| points............Dex 2/5Str 3/5Wis 1/5

Even here a few hole, but you see the main thing; int in all, dex and wis in some others.
magic...............
| spells............
| | offensive.......Int 5/5
| | defensive.......Int 5/5
| | misc............Int 5/5
| | special.........Int 5/5
| methods...........
| | elemental.......
| | | air...........Int 5/5
| | | earth.........Int 5/5
| | | fire..........Int 5/5
| | | water.........Int 5/5
| | mental..........
| | | animating.....Int 3/5Wis 2/5
| | | channeling....Int 3/5Wis 2/5
| | | charming......Int 3/5Wis 2/5
| | | convoking.....Int 3/5Wis 2/5
| | | cursing.......Int 3/5Wis 2/5
| | physical........
| | | binding.......Dex 2/5Int 3/5
| | | brewing.......Dex 2/5Int 3/5
| | | chanting......Dex 2/5Int 3/5
| | | dancing.......Dex 2/5Int 3/5
| | | enchanting....Dex 2/5Int 3/5
| | | evoking.......Dex 2/5Int 3/5
| | | healing.......Dex 2/5Int 3/5
| | | scrying.......Dex 2/5Int 3/5
| | spiritual.......
| | | abjuring......Int 5/5
| | | banishing.....Int
| | | conjuring.....Int 5/5
| | | divining......Int
| | | summoning.....Int 5/5
| items.............
| | held............
| | | wand..........Int
| | | rod...........Int
| | | staff.........Int 5/5
| | | broom.........Dex 2/5Int 3/5
| | worn............
| | | amulet........Int 5/5
| | | ring..........Int 5/5
| | scroll..........Int 5/5
| | talisman........Int 5/5
| points............Int 5/5

For the parts not fully covered, I think tracking have wis. Ot.di have wis, I forgot to write down the figures though. In ot.pe, wis is more important than int, so its ither wis/int 3/2 or 4/1. I bet its the later one.
other...............
| tracking..........Int No:Str/Dex
| swimming..........DexStrCon No:Int
| riding............
| | horse...........DexStr Int
| | camel...........DexStrInt
| climbing..........
| | tree............DexStrInt
| | rock............Con 1/5Dex 1/5Str 2/5Int 1/5
| | rope............Con 1/5Dex 1/5Str 2/5Int 1/5
| valueing..........
| | gems............Int 4/5Wis 1/5
| | jewellery.......Int 4/5Wis 1/5
| | weapons.........Int 4/5Wis 1/5
| | armour..........Int 4/5Wis 1/5
| evaluating........
| | weapons.........Int 4/5Wis 1/5
| | armour..........Int 4/5Wis 1/5
| perception........Lots of Wis Int No:Str/Dex/Con
| direction.........Int Wis No:Str
| health............Con 4/5 Str 1/5
| points............ Con 1/5 Dex 1/5 Str 1/5 Wis 1/5 Int 1/5