External R&D personnel (or contributors) are independent (self-employed) or dependent (employee) workers fully integrated into a statistical unit’s R&D projects without formally being persons employed by the same R&D-performing statistical unit.
R&D surveys.
OECD (2015), Frascati Manual 2015: Guidelines for Collecting and Reporting Data on Research and Experimental Development.
To break down R&D personnel by employment status.