1. The Commission shall review the application and implementation of this Directive.

No later than 18 June 2019, the Commission shall present a report on its application and implementation to the European Parliament, the Council and the European Economic and Social Committee and propose, where appropriate, necessary amendments and modifications.

2. In its review the Commission shall, after consultation of Member States and, where relevant, social partners at Union level, in particular assess:

(a) the necessity and appropriateness of the factual elements for identification of a genuine posting, including the possibilities to amend existing and defining possible new elements to be taken into account in order to determine whether the undertaking is genuine and a posted worker temporarily carries out his or her work, as referred to in Article 4;

(b) the adequacy of data available relating to the posting process;

(c) the appropriateness and adequacy of the application of national control measures in light of the experience with and effectiveness of the system for administrative cooperation and exchange of information, the development of more uniform, standardised documents, the establishment of common principles or standards for inspections in the field of the posting of workers and technological developments, as referred to in Article 9;