[Dylan16807]

I agree with your first sentence but I don't think that argument really supports it. Performance-based testing is not inherently flawed. You just need multiple samples. Bad sleep and stimulants can screw up a lot of other measurements, too, like blood sugar and pressure.

[tomkin]

I agree that it's like blood sugar/pressure, but that's sort of my point. I think if you used blood pressure to judge some one's physical capabilities like you would use IQ to judge some one's mental capacity, you would run into unfair outcomes.

"some one with an IQ greater than 120 is definitely intelligent" == "some one with high blood pressure is definitely unable."

I'm fine with IQ so long as we're not using it as a scientific form of measurement...but we currently seem to.