At the XII ECSMGE conference 1999 in Amsterdam a paper by Berggren was presented, “Ground Improvement – an overview”. The intention of the paper was to form part of discussion in the field of ground improvement and it dealt with categorization and classification of ground improvement. The results of a literature search were discussed with regard to general content and development trends. Essential safety tools such as quality assurance and risk assessment was discussed, as were environmental aspects. The intention now is to develop a continuation of this paper by doing and analyzing a new literature search between 1997 and 2015. More than 4200 literature references during this period have been classified in different categories. The result of the classification may lead the researcher to find his way in this vast area of technology.