There are three participation categories in SIM: Full members, Associate members, and Affiliate members.
Officially designated National Metrology Institutes (NMIs) of any country in the Americas may become a Full member. They are organized into five subregions (Noramet, Carimet, Camet, Andimet, and Suramet), SIM is comprised of metrology organizations from the countries in the Americas and benefits from a Governing Council structured by one coordinator from each subregion, a Technical Committee Chair, a Professional Development Coordinator, a Quality System Task Force Chair , and a Project Coordinator.
A Designated Institute (DI), nominated by their full member NMI , may become an Associate member.
A list of SIM Associate members is available on:
Other organizations with similar or complementary interests and objectives, such as RMOs, Accreditation organizations, Standardization bodies, or other organizations involved in metrology and quality infrastructure, may become an Affiliate members.