Continuous monitoring of radio and television audience and viewing behaviour / program preferences / exposure to radio / leisure activities / political interest and knowledge / reading of daily newspapers / preferences for broadcasting corporations / sense of political efficacy / anomy / opinion leadership / detailed data on occupation / social participation. Background variables: basic characteristics/ residence/ household characteristics/ occupation/employment/ income/capital assets/ education/ social class/ politics/ religion/ consumption of durables/ readership, mass media, and 'cultural' exposure/ organizational membership