Stephen Downes, an information architect with a background in philosophy, created this site with the aim of identifying, indexing, and describing "all known logical fallacies." A logical fallacy can be defined as an error in reasoning in which a conclusion appears to follow from a set of premises but in reality does not. Downes groups the fallacies into thirteen categories, such as Fallacies of Distraction, Inductive Fallacies, and Syllogistic Errors. Each fallacy (over 50 in all) is described with its name, definition, examples of how it might be used in an argument, and how the argument can be proven fallacious. The How to Use this Guide section of the site provides a helpful introduction, and a robust bibliography offers possibilities for further study of logic. In addition, users may register at the site (no fee) to gain access to discussion boards on the topic. The author notes that his Guide "is intended to help you in your own thinking, not to help you demolish someone else's argument." Regardless of how a reader uses the information, however, the site remains an interesting and fun investigation of how logical arguments are constructed.


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