Article 4
1. Without prejudice to Article 6(3), the provisions referred to in Article 1 shall be put into effect, between Ireland and the Member States and other States for which these provisions have already been put into effect when the preconditions for the implementation of those provisions have been fulfilled in all of these Member States and other States, by a decision taken by the Council. The Council may decide to set different dates for the putting into effect of different provisions by subject area. 2. Before the provisions referred to in Article 1 are put into effect in accordance with paragraph 1, the Council shall decide on the detailed legal and technical arrangements, including provisions relating to data protection, concerning the participation of Ireland in the provisions referred to in of Article 1(a)(ii) and (iii), (c)(ii) and (d)(ii). 3. Any decision under paragraphs 1 and 2 shall be taken by the Council, acting with the unanimity of its members referred to in Article 1 of the Schengen Protocol and of the representative of the Government of Ireland. The representative of the Government of the United Kingdom shall also participate in the decisions of the Council under this Article.