The GGP Data collection is conducted by the national teams that involve either national statistical offices or national research institutes or often both. The GGP programme, including the survey and its instruments are developed centrally by a consortium of leading European centres of population research. GGP participating countries implement the GGS questionnaire, developed by GGP working group on Measurement.

Since the countries themselves are resposnible for programme implementation, different standards may be used in different countries in data collection and data preparation.  

The GGP Data Harmonization team is tasked to make the submitted data as cross – country comparable as possible. Before the data is available for the GGP users it will go through its production life cycle from processing, submission, harmonization, archiving and finally dissemination. The data disseminated through the GGP Data Archive are ready to be used in a cross-country comparative study.

The GGP data life cycle can be split into 3 main sections:

  1. Data submission, which contains the information about all the required documentation that the participating country should provide on the submission.
  2. Data harmonisation, which presents the work that is done by the data harmonisation team at NIDI.
  3. Guidelines for data user (Data dissemination), which provides the data availability for all the users.

Once this is complete the data is archived and documented. The documentation for the micro data is split into two sections. First, the Questionnaires which includes both the core questionnaire as well as the country specific questionnaires which were fielded in each country. The second section contains the data documentation. This includes a full and light version of the survey codebook. The full version has details on every variable and the distribution for all countries for which data is available. The light version simply lists the variables which are availble in each wave. In addition to this there are detailed desciptions of the studies in each country including information on sampling, non-response and funding.