The labour force projection is based on an extrapolation of age- and sex-specific labor force participation rates by five-year age groups. Multiplied by the main variant of the current population projection, this yields the projected labour force figures. The underlying labour force participation rates are based on the ILO concept (ILO: International Labor Organization) and thus include all persons who work at least one hour a week for pay or as self-employed persons or family workers, or who are unemployed. Persons undertaking military or civilian service are also included. The labour force participation rates are extrapolated at the national level, using annual averages of the labour force according to the Microcensus Labour Force Survey. The Register-based Census / Register-based Labour Market Statistics are used to estimate the labour force in institutional households. The projection is disaggregated by federal province, based on regional differences in labour force participation rates according to the Register-based Census / Register-based Labour Market Statistics.