Systematic analysis of change in political opinions and behaviour of the Belgium electorate. Individualism / feelings of loneliness and emptiness, social contacts / social leadership / placement of political parties on left-right scale / reasons for ( not ) casting vote for party in last elections for Chamber of Representatives / list or name vote / voted for same party for Senate and Chamber/ reasons for different party choice / 4 most important issues in party choice / called upon services of politicians in the last 4 years/ party of involved politician / did respondent vote for this particular politician / membership of health insurance organization / active membership of ( religious, political ) organizations / respondent considers himself as a follower of one or more parties / ranking of parties on best-worse dimension / political participation and action / viewpoints of respondent himself and of parties on environment, immigrants, free enterprise, privacy, economic growth, public order, Flanders-Wallonia, autonomy of Brussels / materialism-postmaterialism / economic and cultural conservatism / emancipation of women / authoritarianism / influence on politics / ethnocentrism / party membership of well-known politicians / cultural community identification/ Flemish-Walloons culture / environmental involvement / influence of election campaign on vote / language of questionnaire / date of interview / atmosphere of interview. Background variables: basic characteristics/ residence/ household characteristics/ occupation/employment/ income/capital assets/ education/ social class/ politics/ religion/ consumption of durables/ organizational membership