In the context of R&D statistics, the Private non-profit (PNP) sector comprises:
• All non-profit institutions serving households (NPISH), except those classified as part of the Higher education sector;
• Households and private individuals engaged or not engaged in market activities.
OECD (2015), Frascati Manual 2015: Guidelines for Collecting and Reporting Data on Research and Experimental Development.
To break down R&D expenditure by sector of performance and source of funds. Also to break down R&D personnel by sector of employment.