Organizations primarily engaged in research usually on a non-profit basis, in the agricultural, biological, physical and social sciences. Meteorological institutes and medical research organizations are included. Laboratories rendering testing, diagnostic and other services to the medical and dental professions are classified in group 822 (Medical and other health services). Research carried on in association, with teaching is classified in group 821 (Educational services). Research departments, whether at a separate address or not, attached to establishments or groups of establishments whose activities can be classified under a single group of the ISIC are excluded and classified in that group.