Internal consistency
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In statistics and research, internal consistency is the coefficient of test scores. Put more simply, internal consistency measures the consistency of results across items within a single test. One example of internal consistency in research might be a test of two questions. The first statement says "You feel negatively about bicycles." The second statement would say "You like to ride bicycles." If a person agrees with the first and disagrees with the second, the test has internal consistency.
In gaming, internal consistency refers to the consistency of the physical and social rules that affect online computer role-playing games. One example of internal consistency might be that if you can fall from a 1,000 foot cliff in one area and survive, you should be able to fall from a 1,000 foot cliff in any area and survive.
Internal consistency is distinct from realism: most fantasy and science fiction games will strive for internal consistency even when realism is not an issue.