Hi Robert,

although I'm not a specialist in the field of individual psychology, I think that in the best cases IQ tests measure whatever they define as characteristics of the theoretical notion of "intelligence". In some cases this refers mainly to capacity in logical reasoning/thinking, while in others the focus is more with social aspects (e.g. Daniel Goleman: Emotional Intelligence; Bentam Books, NY, 1995).

A more general article about the problem of IQ measurement can be found here:

https://blogs.scientificamerican.com/beautiful-minds/what-do-iq-tests-test-interview-with-psychologist-w-joel-schneider/

Regards, Volker

some reading

http://www.sciencemag.org/news/2011/04/what-does-iq-really-measure

The IQ measures short-term memory, analytical thinking, mathematical ability and spatial recognition. It does not attempt to identify the amount of information one have learned but capacity to learn.

"There is no such thing as a single measure of IQ or a measure of general intelligence".

https://www.cbsnews.com/news/iq-scores-not-accurate-marker-of-intelligence-study-shows/

IQ does what it does in a very narrow sense.

Intelligence is conceptually difficult to define, with no widely accepted standard definition.

Somewhat loosely, IQ might be defined as a single-valued and standardized metric for an individual's ability to solve problems using a wide range of analytical, logical, creative, managerial, emotional and informational skills.