The Research Data Center “International Survey Programmes“ provides researchers with data, services, and consultation on a number of important international study series which are under intensive curation by GESIS. They all cover numerous countries and, quite often, substantial time spans. The RDC provides optimal data preparation and access to a wide scope of data and topics for comparative analysis. The Survey Programmes accessible directly at the RDC are: International Social Survey Programme - ISSP; European Values Study - EVS; Eurobarometer - Survey Series: Standard&Special EB, CCEB, CEEB; European Election Studies - EES; Comparative Study of Electoral Systems - CSES;Beyond providing the mere availability of the study data, the services of the RDC focus on reducing the problems that users would usually have due to issues of comparability over space and time. Such issues lead to a high demand for consultation and specialist knowledge. The RDC provides references to relevant publications, textbooks and related analysis data.A tabular overview of of international comparative survey programmes references over 60 large scale studies and study series since 1948 and based on population samples. In part they are also available through the GESIS standard data service.