The role of the BIE is to regulate the frequency of exhibitions under its jurisdiction, to ensure their quality and to guarantee that they are organised in compliance with international law. These exhibitions include all international exhibitions of a duration superior to three weeks (excluding fine arts exhibitions) and of non-commercial nature, organised by a state and for which the invitations are sent to other states by the diplomatic channel. Fairs are thus not included, and commercial activities are seriously regulated in the Expos organised under the auspices of the BIE.