30.4.2004 Official Journal of the European Union L 16371 COMMISSION REGULATION (EC) No 912/2004 of 29 April 2004 implementing Council Regulation (EEC) No 3924/91 on the establishment of a Community survey of industrial production (Text with EEA relevance) THE COMMISSION OF THE EUROPEAN COMMUNITIES, Having regard to the Treaty establishing the European Com- munity, Having regard to Council Regulation (EEC) No 3924/91 of 19 December 1991 on the establishment of a Community survey of industrial production (), and in particular Article 9 thereof, Whereas: (1) Regulation (EEC) No 3924/91 provides for measures for adjustment to technical progress concerning collection of data and processing of results to be laid down by the Commission after consulting the Statistical Programme Committee. (2)  Technical progress and subsequent legislation, in particu- lar acts relating to the European Business Statistical System, call for adjustments to be made to the survey coverage and characteristics. (3)  These adjustments should improve coverage of the statis- tics provided by the Member States without increasing the burden on economic operators. (4)  The statistical data compiled within the Community system must be of satisfactory quality and comparable from one Member State to another. (5)  The measures provided for in this Regulation are in accordance with the opinion of the Statistical Programme Committee set up by Council Decision 89/ 382/EEC. Euratom (?), HAS ADOPTED THIS REGULATION: Article 1 The field covered by the survey referred to in Article 1 of Council Regulation (EEC) No 3924/91 is to be identified by reference to the survey population and the observation unit. () OJ L 374, 31.12.1991, p. 1. () OJ L 181, 28.6.1989, p. 47. The survey population of the reference period shall be enter- prises whose principal activity or one of its secondary activities is listed in section C, D or E of the classification of economic activities in the European Community (NACE Rev.1.1), set out in Regulation (EC) No 29/2002 of 19 December 2001 (), amending Council Regulation (EEC) No 3037/90 (4. The observation unit shall be the enterprise as defined in Council Regulation (EEC) No 696/93 (°) on the statistical units for the observation and analysis of the production system in the Community. Member States may collect data using another statistical unit as observation unit as long as they transmit Enterprise data to Eurostat. Atticle 2 The obligation of the units of the survey population to supply true and complete information if called upon by the Member States referred to in Article 5(2) of the Council Regulation (EEC) No 3924/91 is to be limited to the survey population's observation units that produce products listed in the PRODCOM list. Atticle 3 The obligation of Member States to adopt survey methods designed to facilitate the collection of data from units repre- senting at least 90 % of national production per NACE class referred to in Article 3(2) of the Council Regulation (EEC) No 3924/91 is to be implemented as Member States' adoption of survey methods designed to enable the collection of data, repre- senting at least 90 % of national production for each NACE Rev.1.1 class of sections C, D and E. Atrticle 4 Member States' exemption from data collection referred to in Article 3(4) of the Council Regulation (EEC) No 3924/91 is to be clarified by reference to national production of a product. () OJL 6, 10.1.2002, p. 3. () OJ L 293, 24.10.1990, p. 1. () OJ L 76, 30.3.1993, p. 5.