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**The RMOs: Regional Metrology Organisations

[Preamble: a generic term denotes the national body in charge of scientific and technical metrology in each country: National Institute of Metrology (NMI) in English (for France: the LNE). According to its structure and organisation, each NMI can be made up of several national metrology laboratories (in France these are the LNE, the LNE-LNHB, the LNE-INM and the LNE-SYRTE) and associated laboratories (in France these are the LNE-CETIAT, the LNE-ENSAM, the LNE-IRSN, the LNE-LADG, the LNE-Femto-St, the LNE-OB, the LNE-Trapil)].

Several factors have led to the creation of Regional Metrology Organisations :
- A high and ever increasing number of countries have joined the Metre Convention since its creation ;
- Strengthened exchanges between countries from a same region ;
- A stronger will for scientific co-operation ;
- Demand for organising comparisons “less official” that under the CIPM for emerging countries and among which countries not yet member of the Metre Convention ;
- Strong demand for access to metrological services.

The first RMOs were created in the years 1970 to 1980s, and there are to date 5 RMOs :

The active members of these regions are the NMIs from countries that have joined the region. Associate members are also accepted, more particularly for the countries in areas where no region has yet been created.

Currently, the RMOs have been able to develop in exponential fashion, and their role in the global metrology arena has undoubtedly been enhanced. The RMOs play a crucial role in the implementation of the Metre Convention.