processing agent — controlled substances used as chemical processing agents in those applications listed in Annex VI, in installations existing on 1 September 1997, and where emissions are insignificant. The Commission shall, in the light of those criteria, and in accordance with the management procedure referred to in Article 18(2), establish a list of undertakings in which the use of controlled substances as processing agents shall be permitted, laying down maximum emission levels for each of the undertakings concerned. In the light of new information or technical developments, including the review provided for in Decision X/14 of the Meeting of the Parties to the Protocol, the Commission may: (a) amend the list of undertakings referred to above in accordance with the management procedure referred to in Article 18(2); (b) amend Annex VI. Those measures, designed to amend non-essential elements of this Regulation, shall be adopted in accordance with the regulatory procedure with scrutiny referred to in Article 18(3) 1.