1. Member States shall bring into force before 1 January 1988 the laws, regulations and administrative provisions necessary for them to comply with this Directive. They shall forthwith inform the Commission thereof.
2. Member States may provide that the provisions referred to in paragraph 1 shall not apply until 1 January 1990.
3. Member States shall ensure that they communicate to the Commission the texts of the main provisions of national law which they adopt in the field covered by this Directive.
4. Member States shall also ensure that they communicate, to the Commission, lists of the examinations organized or recognized pursuant to Article 4.