By 4 July 2018, the Commission shall report to the European Parliament and to the Council on the functioning of this Directive and, if necessary, on the need to amend it, including with regard to the interpretation of serious cases as referred to in Article 3(1), Article 4(1) and Article 5(1), the level of sanctions provided for by Member States and the extent to which the optional elements referred to in this Directive have been adopted.
The Commission's report shall, if appropriate, be accompanied by a legislative proposal.