All current expenditures plus gross fixed capital expenditures for R&D performed within a statistical unit during a specific reference period, whatever the source of funds. Intramural R&D expenditure is synonymous with the performance of R&D within a statistical unit.

The summation of intramural R&D for all sectors is synonymous with the performance of R&D for the entire economy (GERD).

• Research and experimental development (R&D)