Legal units covered by the survey.

Multiannual

Notification letter, the questionnaire and a pre-paid envelope were sent to all companies. Two reminders were sent.

Collection began on September 3, 2018 and was scheduled to end on October 5, 2018. In order to increase the return rate, an extension of the collection was made until April 2019.

By post mail

Enterprise

Strata constituted by APE codes. 32 exhaustive strata and 106 random strata.

9,950 legal units

Questionnaire with 4 blocks:
- Pre-filled identification block of the unit (can be modified by the unit);
- Block that determines the belonging to the defence industry (serves as a filter);
- Block that asks for the turnover distribution by function and product type in 2016 and 2017;
- Block containing all the information needed to complete the questionnaire.