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The data of wave 1, 2, 3 and 4 (wave 4 only for Germany) are available for scholars from GESIS Data Archive for the Social Sciences in Cologne, Germany. Scientific researchers will be asked to fill out a data user agreement, before getting finally access to the data.

Please notice, in the section documentation we provide full information on technical reports, questionnaires and codebook on this webpage.



-> apply for CILS4EU data here



Full vs. reduced version

Due to data security reasons, two different versions are available for each data set:

(1) Full version: a version with complete information collected during the survey and

(2) Reduced version: a version in which specific information was reduced and aggregated in order to prevent the identification of single respondents

The structure of the full and the reduced version of the data set is identical. This means that in both versions the same variables are included, but the variables encompass different information depending on the version of the data set. Variables with reduced or aggregated information are marked with an “RV” at the end of the variable name.

Our codebook (specifically Appendix F) gives you an excellent overview about all variables that were not included or edited in the slightly reduced version. Feel free to inform yourself if the information you are targeting on will be still sufficiently included.

Be aware that the full version is only available for on-site use within the facilities of the Secure Data Center (SDC) of the GESIS Data Archive for the Social Sciences in Cologne, Germany. Only the reduced version is approachable for off-site use: it is downloadable in form of scientific-use-files after signing a contract. While filling out the data user agreement, users have to indicate which version they want to apply for.


Next steps for the future

Our major goal is to store all available waves of CILS4EU at the same place and make them successively available to the international research community in the form of scientific-use-files. For the future, we plan to establish an enduring data infrastructure project which offers new pathways for the research on integration of immigrants in Europe.