Subject-Shift Flaw
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Definition
A reasoning error where the conclusion addresses a different subject than the premises support. The arguer draws a conclusion about X based on evidence about Y, treating them as interchangeable when they are not.
Subject-Shift Flaw in plain English
This flaw is when the evidence is about one thing but the conclusion sneaks in a slightly different thing, as if they're the same. For example: 'This restaurant's kitchen is spotless, so the food must taste great' — clean kitchen (the evidence) and delicious food (the conclusion) are two separate subjects that don't automatically go together. The arguer treats X and Y as interchangeable when they aren't. Catch it by asking: is the conclusion really about the exact same thing the premises measured?
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