[nostrademons]

Then you get into "What's the definition of IQ?" You could argue that IQ is a theoretical construct that's defined to average 100 with a standard deviation of 15 - but then, if you can't measure it with any tests, and when you do try to measure it the tests come up with different numbers, what's the point?

In my physics courses, my professors were always very careful to stress that "If the theory says one thing and the data says another, it's the theory that needs to change." (Well, unless it's a student lab report that measures the speed of light as different from the commonly accepted value. ;-))

[Alex3917]

I agree with what you're saying, my point is just that all of the current IQ tests (including the ones Terman used) were not designed to be measures. That is, someone with an IQ of 200 isn't twice as smart as someone with an IQ of 100, which is what the term 'measurement' implies. (C.f. the book Measurement In Psychology, which was recommended by tokenadult a while ago.) Rather, they are designed to compare people relative to one another. In other words, regardless of whether or not there is some underlying thing called IQ, no one (to the best of my knowledge) has ever tried to measure it.

[Helianthus]

Valid discussion all around! Let's all go get some beers.