• Data reference period
• Geographic localization (Portugal)

• ECONOMIC TERRITORY:  Territory that consists on: (a) the geographic territory administered by a government within which persons, goods, services and capital move freely; (b) any free zones, including bonded warehouses and factories under customs control; (c) the national air-space, territorial waters and the continental shelf lying in international waters, over which the country enjoys exclusive rights; (d) territorial enclaves (i.e. geographic territories situated in the rest of the world and used, under international treaties or agreements between States, by general government agencies of the country (embassies, consulates, military bases, scientific bases, etc.); (e) deposits of oil, natural gas, etc., in international waters outside the continental shelf of the country, worked by units resident in the territory as defined in the preceding subparagraphs.
• EMPLOYMENT:  All persons (either employees or self-employed) engaged in productive activity that falls within the production boundary of the national accounts.
• LABOUR PRODUCTIVITY:  The economic and financial indicator that reflects the productive contribution of the labour input used by the enterprise, measured by hours worked.
• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).

Sum of the absolute differences between regional (NUTS 3 level) and national labour productivity, weighted by the regional share of employment.