• Type of operation: continuous annual periodicity (before 2022, biennial periodicity).
  • Population scope: legal units with 20 or more employees, whose main activity is included in Sections B (mining and quarrying) or C (manufacturing) of CNAE-2009.
  • Geographical scope: the entire national territory.
  • Reference period: the calendar year, which, with some exceptions, coincides with the accounting year of the company.
  • Sample size: Biphasic sampling (14,000 units in the first phase and 5,130 in the second)..
  • Collection method: completion of the questionnaire by the informant, mainly via the Internet (IRIA system).

Methodology documents, questionnaires, classifications...