The assumption that is open to doubt.

　　Since the author does not provide any evidence to substantiate the assumption, many other possibilities might render the assumption suspect.

　　Given other possibilities about the author could not hastily assume that

　　Definition critique

　　Definition of certain critical term in the argument is vague, or the term has no essential logical relation with the conclusion.

　　One problem involves how author defines

　　The definition might be different from what we commonly consider the term to be.

　　As we commonly accept, the term usually means a meaning other that the authors understanding.

　　Therefore, if the term is defined as other ways, the evidence cited by the author is irrelevant to the authors conclusion.

　　In one word, without a clear definition of , it is impossible to assess the strength of the argument.

　　Negative evidence

　　The author cites the evidence that to convince us that

　　However, this piece of evidence may well prove an opposite situation and could seve to refute the authors assumption. The author should provide more convincing evidence to reconcilethis apparent self-contradictory claim.

　　Profit-cost analysis

　　The author hastily claims that we could earn great profits by adopting certain proposal, but fails to analyze the possible cost of doing so.

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