I've come up with a simple way to test some of the skills, and listed ones I know to be able to do this Tested by me: Smithing: at the grinder or workbench, with 100 skill, a pot or enchant increases potential upgrading Enchanting: at the table, with 100 skill, a pot or enchant increases potential upgrading Alchemy: at the table, with 100 skill, enchants still allow more powerful pots Speech: at 100 skill, prices are better with a pot/enchant than they are without. simple way to test I have not yet completed Archery/one hand/2 hand/block/either armor skill: a corresponding item in your menu (a bow if you have 100 archery) reports more base damage with pots/enchants active than without. Dest/resto/illusion/conjuration/alteration: I don't know how to test this. any suggestions from more magey-er folks would be appreciated. I have 100 illusion only right now. Pickpocket: at 100 skill, an item you get caught stealing before does not with pot/enchant. Whether the % changes, and whether it is possible to increase above 100% would also be helpful information. Lockpicking/sneaking I honestly have no idea how to test sufficiently to prove on these skills.