I wanted to find out more about the g Factor

Came across the term g Factor today, and decided to look it up because I remembered having read about it in my uni days. I turned to trusty Wikipedia, and found that
- it meant general factor (abbreviated g) which shows the correlations among mental tests and mental abilities.
- It claims to be able to hold up regardless of the test type or the way in which the test is administered.
- It was a construct developed by Charles Spearman in 1923.
- It is a statistical technique called factor analysis.

Hmm, there are lots more information about it. Shall digest it before posting more. And perhaps dig up my old textbooks! :)