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Message: <blockquote data-quote="Chun-tzu" data-source="post: 948131" data-attributes="member: 1441">IQ changes over time, but not a lot. It's very testable (or more specifically, reliability of IQ scores is pretty good).You've cited examples of the misuse of IQ testing. Yes, it's been misused in the past. That hardly invalidates IQ testing. It costs a LOT of money to get a proper IQ test; people don't waste that kind of money on useless things.The biggest problem with IQ testing is how often results are misinterpreted. That's why when you take a REAL IQ test, you get a report that's several pages long, not just some meaningless number.IQ tests determine, among other things:* level of functioning (important for potential brain damage)* level of ability compared to the general populace* areas of strength and weakness (e.g., verbal vs math skills)They're of most value for determining level of functioning in populations with very low IQs.</blockquote>