@kifill At least in my opinion, it seems like "reading between the lines" is using the phrasing of the stimulus to draw out claims that aren't explicitly stated but can be inferred by phrasing, and assumptions are drawn from knowledge or understanding outside of the stimulus. Take the phrase, "I like reading more than TV because I get a headache after watching TV". The claim "reading does not give me a headache" is implied but not stated, and would be "reading between the lines". Versus the claim "The light from the TV causes headaches" is a claim that seems intuitive, but is ultimately only one of various reasons behind the headaches (sitting far away from the TV, positioning it in front of a window where the sun shines in your eyes, etc). Accepting the claim "The light from the TV causes headaches" would be making an assumption.