Searched around a bit but couldn't find anything about this. In the attribute page the standard Oblivion descriptions are used, for instance "Personality governs speech craft, mercantile, and illusion". The explanation in the skills menu is often different: "Illusion is governed by intelligence". There are a lot more examples like this.
Kind of confusing, and seems important to know which ones are correct. Would also be nice to have a more detailed overview of the game mechanics somewhere as well...
(Really nice game btw, I'm having a lot of fun with it!)