1. Member States shall bring into force the laws, regulations and administrative provisions necessary to comply with this Directive no later than three years after it enters into force. They shall forthwith inform the Commission thereof.
2. When Member States adopt the measures referred to in paragraph 1, these shall contain a reference to this Directive or shall be accompanied by such reference on the occasion of their official publication. The procedure for such reference shall be laid down by Member States.
3. Member States shall communicate to the Commission the text of the provisions of national law which they adopt in the field governed by this Directive.
4. No later than four years after the entry into force of this Directive the Commission shall submit a report to the European Parliament and the Council on the implementation of this Directive, accompanied if appropriate by a proposal for the revision thereof.