The Combination Research Centres were responsible for the development of combinations from data and/or products emanating from the different techniques. The centres developed recommended methods, provided detailed descriptions, and made the necessary software available to the Analysis Coordinator.

Combination Research Centres were maintained by the following institutions:

• Agenzia Spaziale Italiana (ASI), Centro di Geodesia Spaziale (CGS)
• Astronomical Institute, Academy of Sciences of the Czech Republic, and Department of Geodesy, Czech Technical University, Prague
• Deutsches Geodätisches Forschungsinstitut (DGFI)
• Forschungseinrichtung Satellitengeodäsie, Technical University Munich (FESG)
• Forsvarets forskningsinstitutt (FFI, Norwegian Defence Research Establishment)
• GeoForschungsZentrum Potsdam (GFZ)
• Groupe de Recherches de Géodésie Spatiale (GRGS)
• Institut Géographique National (IGN), Ecole Nationale des Sciences Géographiques (ENSG), Laboratoire de Recherche en Géodésie (LAREG)
• Institute of Applied Astronomy, St. Petersburg (IAA)
• Institute of Geodesy and Geoinformation of the University of Bonn (IGGB)

• Jet Propulsion Laboratory (JPL)