CONTENTS 



Author's Preface v 



Translator's Preface ix 



Introduction : Nature and Problem of Intelligence Testing 1 



1. Intelligence and Intelligence Testing 1 



2. Practical Problems of Intelligence Testing 5 



I. Single Tests and Series of Tests 13 



1. Single Tests 13 



2. The Inadequacy of the Single Test 18 



3. Series of Tests 23 



II. The Method of Age-Gradation (Binet-Simoo Method) 29 



1. The Principle of the Method and the Tests Employed. 29 



2. The Resultant Values (Mental Age, etc.) 36 



3. Results with Normal Children 42 



(a) General Distribution of the Level of Intelligence. 43 



(b) Different Age-Levels and Nationalities 46 



(c) Children of Different Social Strata 50 



(d) Intelligence and School Performance 57 



(e) Sex Differences 65 



(f) Repeated Tests with the Same Children 68 



4. Abnormal Children 70 



(a) Mental Arrest and Retardation. Mental Quo- 

 tient 70 



(b) Relation to the Several Tests 85 



(c) Intelligence and School Ability 90 



5. Points of View for the Reorganization and Improve- 



ment of the Gradation Method 91 



(a) Selection and Appraisement of the Tests 92 



iii 



