Owing to the interactive nature of the subject fields managed by the International Associations, six Union Commissions and the Working Group on History (WGH) have been established which serve the Union and the international geophysical community by promoting the study of particular interdisciplinary problems. These bodies are chartered by the IUGG Executive Committee to conduct inter-association science. Union Commissions are reviewed and renewed at each IUGG General Assembly. At present the following Commissions are active:
In addition, two or more International Associations may set up and support joint working groups to address specific scientific topics.