The German Internet Panel (GIP) is an infrastructure project. The GIP serves to collect data on individual attitudes and preferences that are relevant for political and economic decision-making processes. In the present case, this is a recruitment survey.

The questionnaire consists of several parts with experiments and non-experimental questions. Since there are several independent experiments, the allocation of respondents to experimental groups is independent for each block. The questionnaire consists of 5 blocks:

- Experiment: Answer Formats and Priming: Environmental and Nature Conservation Questions (6 groups)
- Experiment: Right-left classification (3 groups)
- Tax rates and social justice (3 groups, 2*2 groups and 2 groups)
- Filter questions (8 groups)
- Feedback questions (3 groups)

Further information can be found in the study documentation.

Topics:
Experiment: Environmental and nature conservation issues: preferred amount of state spending per inhabitant per year on environmental and nature conservation measures; captcha consisting of random numbers; last three digits of telephone number; respondent´s willingness to pay (euros per month) to conserve nature and the environment (in the form of taxes, donations, fees, price increases, etc.).

(Scale) experiment: right-left classification: right-left classification of the parties CDU, CSU, SPD, FDP, Die Linke, Bündnis 90/Die Grünen and Piratenpartei; left-right self-classification.

(Question Formulation) Experiment: Tax Rates and Social Justice: adequate top tax rate in percent; adequate standard rate of unemployment benefit 2 (Hartz-IV) for a couple without children or with two preschool children (in Euro); agreement to increase income tax for all to finance higher standard rates for Hartz-IV recipients; willingness to donate money to a beggar.

Experiment Filter questions: eating out last month; buying new clothes last month, even if not absolutely necessary; at least one week´s holiday in the last 12 months; friends invited to eat home last month; regular saving in the last 12 months; visiting cinema, theatre or concert last month; purchases for personal use in 2011: new car, digital camera, new bicycle, computer or laptop; financial vs. other reasons why not eating out last month (or no purchase of new clothes, no one-week holiday, no friends invited home for dinner, no regular savings, no going to the movies, no new car, digital camera, bike, computer or laptop); respondent could easily afford to eat out (or purchase new clothes, one-week holiday, invite friends home for dinner, regular savings, visits to the cinema, theatre or concert, purchase a new car, digital camera, bike, computer or laptop) vs. was rather an exception.

Feedback questions (respondents should get feedback on how their answers relate to the answers of others): time spent on a working day for television in general, for political news on television, listening to the radio, reading newspapers, reading articles about politics and current political events, and using the Internet for private purposes.

Demography (imported variables): sex; year of birth (categorised); highest school leaving certificate; highest occupational qualification; marital status; number of household members (household size); employment status; federal state; GIP sample (2012).

Additionally coded was: Unique ID; household identifier and person identifier within the household; questionnaire evaluation (interesting, varied, relevant, long, difficult, too personal); overall assessment of the survey; no indication of further comments; allocation to experimental groups.