Study to get insight into behaviour of building-trade workers and painters at the labour market. Career in building trade / motivations for occupational choice / previous occupations / last change of employer / reasons for change occupational activities from may 1974 until may 1976 / preferred sector of building trade, motivation / how did r. get most recent job / periods of unemployment. Background variables: basic characteristics/ residence/ household characteristics/ place of work/ occupation/employment/ education