The two rules for proper classification are:

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The two rules for proper classification are to use a consistent principle and to use essential attributes. Using a consistent principle ensures that all items are classified based on the same criteria, while using essential attributes helps to avoid ambiguity and ensures that each item is placed in the category that best describes it based on its defining qualities. Common sense and mutual joints are not specific enough to guarantee accurate classification, and exhaustive exclusions can sometimes be impractical or unnecessary.

The Two Rules for Proper Classification Are