According to Regulation (EU) 692/2011 of the European Parliament and of the Council (Article 6 (4)3), every year, Member States shall provide the Commission with a report on the quality of the data. The report shall be provided within 9 months after the end of the reference year.

All aspects of the basic principles of quality of European statistics, listed in Regulation 223/2009 on European statistics are evaluated by Eurostat.

• Timeliness and completeness : compliance with transmission deadlines and compliance with the data requirements is evaluated on a regular basis.

• Coherence and comparability : Where possible, data are compared to auxiliary sources. For many variables, there are no comparable robust auxiliary sources.

• Punctuality : the production of the monthly survey by the provider respects the specifications governing deliverable schedule rules.

• Accessibility : data is accessed from a secured exchange portal between the provider and the Insee. Data from SDT are published on the INSEE website in the form of publications and time series.