Study title

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 and an experiment which is identical across all questionnaires. For more information see the study documentation. Topics: verification of first name, last name, sex, year of birth, mobile phone number and landline phone number; corrections; German citizenship; marital status; number of household members (household size); age and sex of up to 6 household members; relationship to each household member; principal residence; highest educational degree, highest professional degree. Professional situation: employment status or other activities; main employment status; previous employment status; occupational status; time limit employment; previous occupational status; previous time limit employment; economic sector; religion; religiousness; computer usage besides study; internet usage; daily internet usage; satisfaction with family, leisure time, financial situation, and work. Social activity: memberships (culture, environment, social cause, religion, youth organisation, civil action, professional, union, political party, other). Vote at last election; Sonntagsfrage; left-right self-placement; party identification. Economic situation: personal income (categories); number of income contributing persons; household income (categories); living space; number of rooms; property: number of houses / flats; number of cars; savings account, building loan contract, life insurance, fixed-interest securities, other securities, company assets, no investments); revenue investments. Additionally coded was: unique ID, GIP; household identifier and person identifier; date of the interview; online equipment at home; assignment to experimental groups; survey evaluation; assessment of...