1.2 The Nature of Intelligence
1.2.1 Theoretical Definitions of Intelligence
1.2.2 Operational Definition of Intelligence
1.2.3 Historical Perspective on Individual Differences and Human Abilities
1.3 Spearmen’s Two-Factor Theory of Intelligence
1.3.1 Critical Appraisal of Two-Factor Theory
1.3.1.1 Thorndike’s Theory
1.3.1.2 Thomson’s Theory
1.3.1.3 Thurstone’s Theory
1.4 Das, Nagliery and Kirby’s PASS Theory
1.4.1 Critical Appraisal of the PASS Theory