1.–2. Principles of reliability of metal and timber structures. 3. Probability parameters and characteristics of effects acting on structures. 4. The characteristic quantities. 5. Design resistance of steel and timber structures. 6.–7. Improvement of theoretical design model of structural system. 8.–9. Initial imperfections of structural members and structural systems. 10. Ideal and actual structure. 11.–12. Problem of interaction and influence of relationships between structural members and carried members on actual action of members of structural systems. 13. Ductility of connections and joints. Semi-rigid joints.