O. Introduction
0.1. Background of the study
0.2. Measurement Design of the ’IDSS'- Study
0.3. Sampling Design
0.4. Material and Measures
0.5. Aim of the Data Handbook
0.6. Contents of the Data Handbook
1. Syllogistic reasoning
1.1. Description of the concept
1.2. Description of the measures
1.3. Investigation procedures and instructions
1.4. Scoring instructions and coding rules
1.5. List of Variables
1.6. Assessment of the nine year old children
1.7. Assessment of the twelve year old children
1.8. Assessment of the fisteen year old children
1.9. Assessment of the seventeen year old children
2. References
18
19
21
28
65
84
104
117
7
9
2
1