• Type of operation: continuous on a biennial basis (for odd reference years).
  • 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: 5,700 units, approximately.
  • Collection method: completion of the questionnaire by the respondent using one of the following means: internet (IRIA system), e-mail, fax, telephone or postal mail.

Methodology documents, questionnaires, classifications...