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The Portuguese Society for Soil Mechanics (PSSM) was created in 1951 and became a member of ISSMFE in 1955. PSSM has changed the name to Portuguese Association for Soil and Rock Mechanics (PASRM) after becoming a member of ISRM in 1962. Later in 1972 PASRM became a member of IAEG and to reflect the international membership the society has changed the name to SPG (Portuguese Geotechnical Society). Finally in 2006 SPG became a member of ITA and has also integrated IGS. 

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SPG members have been actively participating in several Technical Committees of ISSMGE, ISRM, IAEG, ITA and IGS. 

SPG publishes the journal Geotecnia, with a triannual frequency, since 1971.

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SPG has organized a number of international conferences, namely:

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• 1^st ISRM Conference, 1966
• 7^th IAEG Conference, 1994
• 3^rd International Conference on Environmental Geotechnics, 1998
• 2^nd International Conference on Earthquake Geotechnical Engineering, 1999
• 2^nd International Conference on Site Characterization, 2004
• 11^th ISRM Conference, 2007
• 8^th International Conference of Stress Wave Theory to Piles, 2008
• 3^rd International Conference on Transportation Geotechnics, 2016

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The success of the mentioned events was for us a strong incentive to organise for the first time in Lisbon the XVIII European Conference on Soil Mechanics and Geotechnical Engineering. 

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