IAAO (International Association of Assay Offices) is an organization established to promote the exchange of information and technical cooperation between the authorized Assay offices of the states concerned to ensure cooperation with relevant organizations and stakeholders to improve processes in the field of control of articles of precious metals in their national systems.

As the main benefit of membership is a participation in inter-laboratory round-analysis. Inter-laboratory comparisons are important to the quality system of the laboratory accreditation according to ISO 17025, and a large number of participants in Round Robin have statistically significant results that prove competence.

Bureau of Metrology has become a member of this organization by signing the Memorandum of Understanding with IAAO on October the17, 2012.