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Fallacy Files: Begging the Question
Discusses the error in logic behind the fallacy of Begging the Question (also known as Circular Argument, Circular Reasoning, Circulus in Probando, Petitio Principii, or Vicious Circle). Although a great deal of information about the...
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Bbc: H2g2 Circular Reasoning
Excellent definition and discussion of the term "Circular Reasoning," including a couple of very clear examples.
Khan Academy
Khan Academy: Match a Flaw Learn More
Match a Flaw questions are nearly identical to Match the Structure questions, but with the added information that the argument in the passage is flawed (and therefore, the argument in the answer will be as well). They can sometimes be...