Part I. Introduction: 1. What is intelligence and what are the big questions about it? Robert J. Sternberg; 2. Approaches to understanding human intelligence Robert J. Sternberg; Part II. Approaches to Studying Intelligence: 3. Early history of theory and research on intelligence Robert J. Sternberg; 4. Psychometric approaches to intelligence Alan S. Kaufman, W. Joel Schneider and James C. Kaufman; 5. Cognitive approaches to intelligence Victor J. Ellingsen and Randall W. Engle; 6. Biological approaches to intelligence Richard J. Haier; 7. Cultural approaches to intelligence Robert J. Sternberg; 8. Systems approaches to intelligence Robert J. Sternberg; Part III. Theories on the Development of Intelligence: 9. Genetics/genomics and intelligence Mei Tan and Elena L. Grigorenko; 10. Environment and intelligence James R. Flynn and Robert J. Sternberg; 11. Lifespan development of intelligence Christopher Hertzog; Part IV. Applications of Intelligence Research: 12. Extremes of intelligence Julian G. Elliott and Wilma C. Resing; 13. Group differences in intelligence Diane F. Halpern and Tomoe Kanaya; 14. The predictive value of intelligence Paul R. Sackett, Oren R. Shewach and Jeffrey A. Dahlke; 15. The relationship of intelligence to other psychological traits Colin G. DeYoung; 16. Intelligence, education and society Richard E. Mayer.