Chapters: 1. Intelligence: History of the Concept. 2. What is Intelligence? 3. Tests and What They Measure. 4. Regression Toward the Mean - a Mysterious Force of Nature? 5. Entry of the Theories. 6. The Hereditarian Viewpoint. 7. Interaction. 8. Milieu and Compensation Programs. 9. Education, Equality and Talent Reserves. References.