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Fallacies in Reasoning
Logical fallcies based on lecture by Dr. David Zaresky
24
Debate/Speech
9th Grade
02/18/2006

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Term
claim
Definition
the conclusion, or idea, you want your audience to accept
Term
warrant
Definition
the reasoning step; the logical steps that relate the data to the claim
Term
data
Definition
the evidence that supports the claim
Term
fallacy
Definition
a deficiency in the form of an argument that is not immediately apparent.
Term
deficiencies in clarity
Definition
result from the inexactness of language
Term
equivocation
Definition
the use of the same word to convey different meanings in the same argument.
Term
ambiguity
Definition
results when we cannot be sure which of a set of possible meanings is the intended meaning.
Term
vagueness
Definition
a situation in which a term or concept is indeterminate.
Term
heap
Definition
not knowing precisely when a difference in degree becomes a difference in kind
Term
slippery slope
Definition
an argument that suggests that a seemingly trivial or inconsequential action will start an irreversible chain of events leading to catastrophe.
Term
deficiencies in relevance
Definition
result from introducing a factor that has nothing to do with the relationship between the evidence and the claim
Term
ad hominem attack
Definition
an attack on a person is substituted for a response to an argument
Term
appeals to authority
Definition
fallacies if they substitute for argument or if the authority is outside the area of his or her expertise or has no basis for reaching conclusions
Term
appeals to popularity
Definition
substitute the fact that others support an idea for an argument in its behalf
Term
appeals to tradition
Definition
saying that we should continue with something because we have always done it that way
Term
appeals to ignorance
Definition
assume that a claim must be true (or false) because the opposite position cannot be proved (or disproved)
Term
appeals to inappropriate emotion
Definition
prevent argument through expressions of anger, fear, or other emotions impervious to argument
Term
fallacies of vacuity
Definition
result from failure to provide necessary proofs, leaving “holes” or empty spaces in the argument
Term
circular reasoning
Definition
occurs when the evidence simply restates the conclusion in different words
Term
begging the question
Definition
occurs when a claim is made dependent on other claims that are implicitly assumed but have not established in the argument
Term
ignoring the question
Definition
the result of a digression or a focus on matter extraneous to the situation at hand; “red herring”
Term
non sequitur
Definition
an argument in which, on the face of it, no connection exists between the claim and the evidence
Term
straw man
Definition
when one’s argument responds to a claim that has not been made and that is not in dispute, rather than to the relevant claim
Term
self-sealing argument
Definition
an argument that does not admit of any possible testing or falsification because it can encompass seemingly opposite results.
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