Final answer:
Intelligence tests can be described using a three-level hierarchy, according to the Cattell-Horn-Carroll theory of cognitive abilities.
Explanation:
Most intelligence tests are the best described by a three-level hierarchy. The Cattell-Horn-Carroll (CHC) theory of the cognitive abilities explains this hierarchy.
According to the theory, there are general abilities at the top level, broad abilities in the middle level, and narrow (specific) abilities at the bottom level.
General intelligence is at the top, followed by the abilities like fluid reasoning, short-term memory, and processing speed in the broad level, and specific forms of the cognitive abilities in the narrow level.