Total intramural expenditure on R&D performed during a specific reference period, broken down by the fields of research and development. The fields included are:
1. Natural sciences
2. Engineering and technology
3. Medical and health sciences
4. Agricultural and veterinary sciences
5. Social sciences
6. Humanities and the arts.
R&D surveys.
Adapted from OECD (2015), Frascati Manual 2015: Guidelines for Collecting and Reporting Data on Research and Experimental Development.