Annual

Internet with the possibility of using postal means upon demand. The collection takes place on the third and fourth quarter of the year n +1.

Data collecting is annual. Current expenditures are collected every 3 years since 2004.

The frame is the statistical directory of companies (SIRUS).

The sampling method is stratification by industry, unit size and location (since the reference year 2014). The allocations are optimized on the amounts of research and investment in previous surveys (Neyman allocation). They are completeness beyond a certain threshold.