My personal opinion is that looking at IQ can be very informative when the kid is young--because little kids usually don't achieve much anyways, even the really smart ones. But as they get older, I'd rather look at achievement which is a combination of talent and how the kids are using their talent. And of course this is only when we talked about intellectual achievements. There are many types of other achievements that are equally important to the society and rewarding to the individual that don't require a high IQ.