Continuous items for most waves watching tv / reading papers / taking part in discussions on political issues / political knowledge / political participation / party preference / questions concerning importance of different political issues / left and right in politics. Wave 19: Most important problem / use of bicycle / knowledge of ENWB / use of bicycle by children / use of car / how to stimulate use of bicycle / definition and self-description in terms of left, right / agreement with politicians / interest in and knowledge of elections European parliament / which problems better solved by European community or by Dutch parliament / vote-intention / European elections / attitude to European parliament / opinions about seeing to Dutch interests in EC / internationalism. Background variables: basic characteristics/ place of birth/ residence/ household characteristics/ occupation/employment/ income/capital assets/ education/ politics/ organizational membership