Annual

The collection takes place from June to October of the year n+1.

Data collecting is annual. Current expenditures are collected every 3 years since 2004. Current expenditures are not collected this year.

Local unit (of an enterprise)

The frame is the Statistical business register  (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). All establishments employing more than 250 employees are in the sample.