Article 4 Data sources

While complying with conditions as to quality referred to in Article 6, Member States may collect the information required under this Regulation using any sources that they consider relevant. National authorities shall be authorised, within their sphere of competence, to collect, for statistical purposes, information covered by this Regulation contained in administrative and legal files.

Where the required data cannot be collected at a reasonable cost, national authorities may use statistical estimation procedures, while respecting the need for accuracy and quality.