• Data reference period (Quarter)
• Geographic localization (Portugal)
• Economic activity (NACE Rev. 2)
• Index source of variation

• ECONOMIC ACTIVITY:  Combination of resources such as labour, raw materials, equipment, etc., are joined, leading to the creation of specific goods or services. Regardless of the factors of production integrating the good or service produced, all activities generically imply an input of products (goods or services), a production process and an output of products (goods or services).
• REFERENCE PERIOD:  The length of time for which data are collected, e.g. a specific day, month or year.
• LABOUR COST:  The cost incurred by the employer in the employment of labour. It is divided into direct costs and indirect costs. Subsidies for the compensation of direct remuneration are deducted from the total cost.
• ENTERPRISE:  Legal entity (natural or legal person) that is an organisational unit producing goods or services, which benefits from a certain degree of autonomy in decision-making, especially for the allocation of its current resources. An enterprise carries out one or more activities at one or more locations.

[(Labour cost index on year n, quarter t / Labour cost index on year n-1, quarter t)*100-100]