123test
Alle informatie over de iq test (iqtest), intelligentie testen, hoogbegaafdheid en capaciteiten. bepaal je echte iq met een goede iqtest, of doe oefen iq tests of uitgebreide iq testen.
http://www.iq-test.nl/
Intelligence theory/testing
This site includes biographical profiles of people who have influenced the development of intelligence theory and testing, in-depth articles exploring current controversies related to human intelligence, and resources for teachers.
http://www.indiana.edu/~intell/
Uncommonly difficult iq tests
Difficult iq tests designed by ronald k. hoeflin -- the mega test, the titan test, and others.
http://www.eskimo.com/~miyaguch/hoeflin.html