The Labour Force Survey collects statistical data on the participation in work, employment, unemployment and activity of persons outside the labour force among the population aged between 15 and 74. The Labour Force Survey data collection is based on a random sample drawn twice a year from the Statistics Finland population database. The monthly sample consists of some 12,000 persons and the data are collected with computer-assisted telephone interviews. The information provided by the respondents is used to produce a picture of the activities of the entire population aged between 15 and 74. A so-called ad hoc module with annually changing topics is also carried out in connection with the Labour Force Survey.