3.2.1999 Official Journal of the European Communities L 29/55 COMMISSION DECISION of 25 January 1999 on the procedure for attesting the conformity of construction products pursuant to Article 20(2) of Council Directive 89/106/EEC as regards precast normal/light- weight/autoclaved aerated concrete products (notified under document number C(1999) 118) (Text with EEA relevance) (1999/94/EC) THE COMMISSION OF THE EUROPEAN COMMUNITIES, Having regard to the Treaty establishing the European Community, Having regard to Council Directive 89/106/EEC of 21 December 1988 on the approximation of laws, regulations and administrative provisions of the Member States relating to construction products ('), as amended by Directive 93/68/EEC (), and in particular Article 13(4) thereof, Whereas the Commission is required to select, as between the two procedures under Article 13(3) of Directive 89/ 106/EEC for attesting the conformity of a product, the ‘least onerous possible procedure consistent with safety’; whereas this means that it is necessary to decide whether, for a given product or family of products, the existence of a factory-production control system under the respons- ibility of the manufacturer is a necessary and sufficient condition for an attestation of conformity, or whether, for reasons related to compliance with the criteria mentioned in Article 13(4), the intervention of an approved certi- fication body is required; Whereas Article 13(4) requires that the procedure thus determined must be indicated in the mandates and in the technical specifications; whereas, therefore, it is desirable to define the concept of products or family of products as used in the mandates and in the technical specifications; Whereas the two procedures provided for in Article 13(3) are described in detail in Annex III to Directive 89/ 106/EEC; whereas it is necessary therefore to specify clearly the methods by which the two procedures must be implemented, by reference to Annex III, for each product () OJ L 40, 11. 2. 1989, p. 12. () OJ L 220, 30. 8. 1993, p. 1. or family of products, since Annex III gives preference to certain systems; Whereas the procedure referred to in point (a) of Article 13(3) corresponds to the systems set out in the first poss- ibility, without continuous surveillance, and the second and third possibilities of point (ii) of section 2 of Annex III, and the procedure referred to in point (b) of Article 13(3) corresponds to the systems set out in point (i) of section 2 of Annex III, and in the first possibility, with continuous surveillance, of point (ii) of section 2 of Annex I11; Whereas the measures provided for in this Decision are in accordance with the opinion of the Standing Committee on Construction, HAS ADOPTED THIS DECISION: Article 1 The products and families of products set out in Annex I shall have their conformity attested by a procedure whereby the manufacturer has under its sole respons- ibility a factory-production control system ensuring that the product is in conformity with the relevant technical specifications. Article 2 The products set out in Annex II shall have their conformity attested by a procedure whereby, in addition to a factory-production control system operated by the manufacturer, an approved certification body is involved in assessment and surveillance of the production control or of the product itself.