The German Internet Panel (GIP) is an infrastructure project. The GIP serves to collect data about individual attitudes and preferences which are relevant for political and economic decision-making processes.

The questionnaire contains numerous experimental variations in the survey instruments. For further information, please refer to the study documentation.

Topics: Environmental attitudes: acceptance of higher prices for environmentally friendly products; acceptance of energy saving to stop climate change; environmentally friendly behaviour: frequency of buying environmentally friendly products and frequency of energy saving in everyday life; beliefs about environmentally friendly products as a contribution to environmental protection; beliefs about energy saving as a contribution to climate change.

Lobbying: estimated influence of lobbying on EU policy; influence of lobbying on German policy compared to the influence on EU policy; assessment of the influence of lobbying on EU policy; in principle positive or negative influence of lobbying on EU policy; actors who benefit most from lobbying at EU level (industry, EU citizens, charities, politicians, others); estimated influence of lobbying on EU climate policy; assessment of the influence of lobbying on EU climate policy; influence of lobbying on the level of climate protection in the EU; sufficient information for EU citizens to understand lobbying at EU level; impact, if complete information is available, on the influence of lobbying on EU policy.

Experiment on the respondent´s attention: voting behaviour in a referendum on Germany´s EU membership (Sunday question).

Satisfaction with the performance of the parties CDU/CSU, SPD, Bündnis90/ the Greens, Die Linke, AfD and FDP in the Bundestag; perception of the federal government as divided versus closed; perception of the parties CDU, CSU, SPD, FDP, Bünnis90/ Die Grünen, Die Linke and AfD as divided versus closed; perception of the statements of the above parties as vague versus accurate.

Experiment: Approval of a proposal that calls into question Turkey´s EU accession negotiations with reference to support for this proposal by a particular political party or by a particular political party under the respective party leader(s).

Experiment: Approval of a Bundestag proposal on the assessment of health technologies (or an EU regulation on the assessment of health technologies) with reference to criticism from a particular political party that this proposal would lower the standards for the assessment of health technologies in Germany.

Importance of the proposal on health technology assessment for the respondent; likelihood of ever voting for the parties CDU/CSU, SPD, FDP, Bündnis90/ Die Grünen, Die Linke and AfD; recall of the exact answers on environmental attitudes (acceptance of higher prices for environmentally friendly products, acceptance of energy saving to stop climate change, frequency of buying environmentally friendly products, frequency of energy saving in everyday life, environmentally friendly products as a contribution to environmental protection and energy saving as a contribution against climate change); recall of the information and certainty of the assessment.

Demography: sex; age (year of birth, categorized); highest educational degree; highest professional qualification; marital status; household size; employment status; German citizenship; frequency of private Internet usage; federal state.

Additionally coded was: respondent ID; household ID, GIP; person ID (within household); year of recruitment (2012, 2014); interview date; current online status; assignment to experimental groups; activation of Java Script during the experiment for the respondent´s attention.

Questionnaire evaluation (interesting, varied, relevant, long, difficult, too personal); overall evaluation of the survey; respondent made further comments on the questionnaire.