Monthly

Data collection is by post, and centralized collection at some enterprises (example Lagrange).

Questionnaires are sent at the end of the month for the month of collection.

By post mail

Legal unit

The sampling frame is the file of the other collective housing managed by INSEE. The stratification criteria for the national sample are:
- the geographical focus (regions, national tourist areas (ETNs))
- type of establishment
Within the strata, the draw is random.

The survey is conducted among a national sample of approximately 2,500 establishments from 3,500.