On behalf of the Scientific Committee, you are cordially invited to submit abstracts of 300 to 500 words for the following seven themes: 1. Geotechnical Risk Management and Risk Communication 2. Variability in Ground Conditions and Site Investigations 3. Reliability and Risk Analysis of Geotechnical Structures 4. Limit-state Design in Geotechnical Engineering 5. Assessment and Management of Natural Hazards 6. Contractual and Legal Issues of Foundations and (Under)Ground Works 7. Case Studies, Monitoring and Observational Method