Knowledge of and exposure to 'van onderen' radio and tv-programs in which the situation of workers, the work of trade-unions, and works-councils etc. is discussed critically / opinions on and perception of trade-unions, about own work situation, about the works-council / exposure to media / political interest / general life satisfaction / income / housing etc.. Background variables: basic characteristics/ residence/ occupation/employment/ income/capital assets/ education/ politics/ religion/ readership, mass media, and 'cultural' exposure/ organizational membership