When it comes to intelligence, many people reference IQ. But, as I've said many times before it's not a complete picture of intelligence. IQ tests were designed to determine services for people who have low intellect.
There are so many different ways to be intelligent. I'm not sure it's all quantifiable. Such as the child that can pitch a ball with speed and precision, the ability to sense emotions, or just general social skills often go unmeasured.
And, I often hear people say they know someone is intelligent. Sometimes, I think people use it to say "I agree with this person."
So, how do you decide whether or not you think a person is intelligent?