The systematic review of the ISMN standard which takes place every four years resulted in eleven members voting in favour of confirmation and five members voting in favour of a revision of the standard. Therefore, ISO 10957 could not be confirmed. The TC46 / SC 9 secretariat requested the International ISMN Agency as the Registration Authority to decide on the appropriate course of action. This request paved the way for the International Agency to initiate a revision process which is supposed to lead - in accordance with decisions made at the 12th ISMN Panel Meeting in Berlin - to a new 13-digit format of the ISMN.