Saturday, November 11, 2006

Logical Fallacies, Part 19: Composition

On the flip side of the fallacy of division (see November 4 posting) is the fallacy of composition. It arises when reasoning that something true about a part of a subject must be true of the whole. Examples:

New Yorkers are aggressive people. I should know: I’ve met two aggressive New Yorkers.

The project manager is brilliant, so I’m sure that the entire project team is up to the task.

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