Monthly survey on employment, working time, earnings and labour cost in large enterprises: Data are collected monthly on enterprises with more than 500 employees covering sectors from B to N of Nace rev.2. Enterprises have been selected from Istat Business Register (Asia 2010); in 2010 large enterprises survey includes 1300 enterprises that represent 22.2 per cent of total employees in the register (16.5 per cent in industry and 26.7 per cent in services). The survey collects information on the number of employed persons, working hours, labour cost, salary and wages at the end of the month.