I've made a series of formlists and I've made a series scripts to make stuff happen when something from any of those lists gets used. Now I've run into the issue of how to determine when an item is used that is found in one of those lists. I wrote out the whole script with Player.GetIsUsedItem.IsInList ItemList1 without stopping to check my syntax. This obviously doesn't work. I'm sure there is a very simple answer but I'm not seeing it.

So I'm guessing that the answer is not as simple as I thought. That makes me feel a bit better, I think.

I'll be switching my scripts to something like:

if player.GetItemUsed 1stItem == 1
Do Cool Stuff 1
if player.GetItemUsed 2ndtItem == 1
Do Cool Stuff 1
if player.GetItemUsed 3rdItem == 1
Do Cool Stuff 2
if player.GetItemUsed 4thItem == 1
Do Cool Stuff 2

That should work.

Some functions that accept an object can be passed a list instead, e.g. player.GetItemCount MyList.
Alternatively you could iterate through your list with FOSE and check GetItemUsed EachObject in one loop, to make it easier to expand.

Forgive me, I'm not all that familiar with the ins and outs of FOSE. Would I have to use something like ListGetNthForm?

ListGetNthForm List1 1
ListGetNthForm List1 2
ListGetNthForm List1 3
Do Stuff
ListGetNthForm List2 1
ListGetNthForm List2 2
Do Stuff

Or is there some other command I need to look at?