Abstract: This position paper briefly summarizes the present status regarding the combination of space techniques concentrating on a rigorous and consistent combination of ITRF, EOP and ICRF. Recommendations for improvements related to still existing deficiencies are presented. Further subjects include the intention, goal and set-up of the SINEX combination campaign, as well as a list of participants, a summary of the data pool and of the individual solution characteristics. Finally future steps, recommendations and action items are presented to stimulate discussions between the participating groups, which should be considered as a first step to achieve the ambitious goals of the SINEX combination campaign. 1 Introduction an
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