Type 3 · Verification Habitat Mismatch
Wrong Test
The evidence doesn’t match the kind of claim being made. Different claims live in different “habitats,” and using the wrong test is like measuring temperature with a ruler.
The move, up close
“A Nobel physicist endorses this diet, so it works.”
Testimony is used to settle a claim whose habitat is observation and experiment.
Expertise is real — and testimony is a legitimate method, in its place.
The authority is off-domain, and a nutrition claim is verified by trials, not by endorsement.
What it sounds like
You’ve heard this one.
“A famous scientist said it, so it must be true.”
“It worked for me, so it’ll work for everyone.”
“Look at all these likes — people agree!”
“The experts all agree on this policy.”
“This is what the Founders intended.”
Classic fallacies
Names you already know.
The tag on each names the move in AOML coordinates — source → target: what got swapped in for what.
Authority used outside the expert’s domain.
Used popularity as proof of truth.
Used longevity as proof; age ≠ validity.
A biased sample — you only see the winners.
The test
What kind of evidence would actually be required here? A scientific fact needs experiments and data; a moral principle needs ethical reasoning; a historical event needs primary sources.
How to respond
Name the move, not the fallacy.
“That’s an appeal to authority!”
“They’re an expert in X, but this is Y. What do experts in Y say?”
“Bandwagon fallacy!”
“Lots of people believe it — but what’s the actual evidence?”
“Anecdotal evidence!”
“That’s your experience, which is valid. What does the broader data show?”
The key insight. Just because evidence is real doesn’t mean it’s relevant. The question is always: does this kind of evidence belong in this habitat?
Don’t confuse with Type 1. Type 1 uses the wrong kind of truth (feelings to prove facts); Type 3 is on the right topic but uses the wrong form of verification within it (popularity or authority instead of data).