In 1995 the first international symposium on cone penetration testing was held in Linköping, Sweden. In the Nordic countries at that time, focus was on improved accuracy of the CPT probes, national standardization and increased use of CPT due to improved experience and increased local databases. Since then, additional sensors have been added to the probes, the interpretation methods have been extended and refined and the interest for combinations with other measurements, such as resistivity or seismic, have increased.