Punctual or aperiodic

Internet with the possibility of sending by mail upon request. The data collection of the year n takes place from September to December n + 1.

The survey is aperiodic. The two last surveys were conducted in 2007, on the observation years 2006 and in 2013, on the observation year 2012.

The data collection of the year n takes place from September to December n + 1.

Local unit (of an enterprise)

Since 2012, the sampling frame is the Sirus directory (directory of statistical units).

The sampling method: stratification by sector of activity and by local unit size.

The survey is more exhaustive for establishments of 250 or more employees.