Hey Dan —
Your instincts are correct — all argument flaws can be described both in terms of “takes for granted” and “fails to consider” — those are just two different ways to think about reasoning issues, and there isn’t a right or wrong way (in regards to those two phrases) to think of any particular argument flaw — in addition, if you get yourself in the habit of going to both viewpoints in order to try to understand the flaws you are seeing, you’ll put yourself in a better position to recognize flaws you might not otherwise, and also to understand flaws more completely than you might otherwise —
Sorry if the instructions for the drill make it appear as though you had to pick one phrasing or the other — I’ll discuss the value of thinking both ways more as you get deeper into the book —
Hope you are finding the Trainer useful thus far, and if you need anything else just let me know —
Mike