(48)TSIs will be revised at regular intervals. When errors are discovered, an ad hoc rapid procedure should be set up in such a way that a provisional corrigendum is first agreed in the context of a committee and then published by the Agency. This will allow an earlier use of this corrigendum by all stakeholders, including industry, notified bodies and authorities, pending a formal revision of the TSI by the Commission. In order to avoid confusion with official corrigenda of the Commission, the term technical opinion will be used. This procedure is in line with the mandate adopted by the Commission in Decision of 13 July 2007 concerning a framework mandate to the European Railway Agency for the performance of certain activities under Directives 96/48/EC and 2001/16/EC. However, if the TSI needs to be amended because of an important or critical error, a revision procedure should be applied.