Committees and Panels are expected to be permanent in nature. The mandate of a Committee or Panel is defined in such a manner that its existence is not dependent on the completion of specific tasks.

A Committee or a Panel may set up informal subgroups to deal with specific tasks described in its mandate. An informal subgroup is not considered as a Working Group but as an instrument of a Committee or Panel to accomplish its mandate. It remains under the responsibility of its Committee or Panel to whom it reports. Work prepared by informal subgroups under a subgroup leader is discussed and agreed by its Committee or Panel. A subgroup does not generate further substructures.