a way to discover the excact size or amount of something (the result must be expressed by number(s) and a unit(s))
Unit: a reference "amount" of something (examples: temperature-Kelvin, distance-metre, etc)
There are different types of intelligence
The ability to learn, think and solve problems is not restricted to logical puzzles. Yet IQ tests are, making them unrepresentative.
IQ tests captures too little to accurately represent intelligence
"""After conducting the largest online intelligence study on record, a Western University-led research team has concluded that the notion of measuring one's intelligence quotient or IQ by a singular, standardized test is highly misleading. The results showed that when a wide range of cognitive abilities are explored, the observed variations in performance can only be explained with at least three distinct components: short-term memory, reasoning and a verbal component.
No one component, or IQ, explained everything. Furthermore, the scientists used a brain scanning technique known as functional magnetic resonance imaging (fMRI), to show that these differences in cognitive ability map onto distinct circuits in the brain.""" [1
IQ even fails at measuring logical problem-solving skills. IQ misrepresents intellectual ability by oversimplifying it into one number when you need at least three.
Intelligence Quotient is not a valid unit for measurement
Unlike the Kelvin, the metre or the second, IQ is not actually a defined unit. Nobody knows what 1 IQ means, nor do we know the actuall difference between a person with 200 and one with 300 IQ. All IQ tells us is where on the distribution of test scores any given person would land. If everyone become twice as smart, IQ scores would not change. And no, the test scores are not valid measurement units either. The tests are made with difficulty corresponding to the capability of humans. We know that animals are intelligent to some degree, but unlike good measurements like kilogram, IQ tests are incompatible with animals. We would need to make new tests for animals. But then we wouldn't know how high of an IQ a human would get if it were to take the new easier test for animals.
IQ cannot actually measure intelligence as it neither has a unit of intelligence nor a scale of intelligence.
I find no support this statement in PRO's source, and it didn't mention a shark either. The study's conclusion is as follows: "Cortical thickness is positively associated with general intelligence (g) in a wide distribution of cortical association areas in both brain hemispheres." Correlation between the size of the brain and cognitive abilities is not the same as IQ describing the other types of intelligence. Thus, IQ is still not proven representative for intelligence.
the IQ is directly correlated with the success within each respective profession
This correlation between IQ and success is not conclusive evidence. Even if IQ was directly correlated to intelligence it would still not be a good measurement of intelligence. On average, mass is correlated to a star's volume, but that doesn't mean that kilogram is a good measure of volume. To measure the volume of a star you have to measure the diameter of that star. Similarly, you cannot measure intelligence without testing all relevant aspects of it.
At best, IQ is an estimation of total intelligence --- not a measurement. With current technology and our limited knowledge it is impossible to measure intelligence.
IQ is not a good measure of intelligence. The resolution fails.