This part offers an overview over the characteristics and dynamics of the labour force, information about working population by activity sector, by type of contract or by number of rest days. Some of the sources are the Survey on the Population in Relation to Activity (PRA), quarterly released, the annual Labour Market Census operation (CMT) - Supply – and the main of it is provided by the Population and Housing Census (CPV) carried out every ten years, and assisted by the Population and Housing Statistics (EPV) every five years.