• Data reference period (Month)
• Geographic localization (Portugal)

• 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.
• REFERENCE PERIOD:  The length of time for which data are collected, e.g. a specific day, month or year.

Manufacturing Industry Confidence Indicator  is calculated according to the methodology of the EC - DG ECFIN, and corresponds to the arithmetic mean of the balances of the following questions:
- Do you consider your current overall order books to be...? 1. + more than sufficient (above normal); 2. = sufficient (normal for the season); 3. − not sufficient (below normal).
- [Inverted Sign] Do you consider your current stock of finished products to be...? 1. + too large (above normal); 2. = adequate (normal for the season); 3. − too small (below normal).
- How do you expect your production to develop over the next 3 months? It will... 1. + increase; 2. = remain unchanged; 3. -  decrease.