The Viennese Agreement was signed in 1991 by the CEN and the International Standards Organization (ISO), but came into force in the mid-2000s. Its main objective is to avoid duplication in the (potentially contradictory) standards between the NEC and ISO. Over the past decade, the NEec has adopted a series of ISO standards that have replaced the corresponding NEEc standards.  The standards bodies of the 30 national members represent the 27 Member States of the European Union, three countries of the European Free Trade Association (EFTA) and countries that will join the EU or EFTA in the future. The CEN contributes to the objectives of the European Union and the European Economic Area in terms of technical standards (EN standards) that promote free trade, worker and consumer safety, interoperability of networks, protection of the environment, use of research and development programmes and public procurement. An example of harmonized standards is the standards for materials and products used in the construction sector and contained in the Construction Products Directive. The CE mark is a manufacturer`s statement that a product complies with all relevant European directives. About 80% of all European electrical engineering standards are the same or based on the CIS`s international standards. This level was achieved by the Dresden agreement signed between the two organizations in 1996. But much has changed since then – global trade in electrical and electronic equipment has accelerated and product differences have shingd considerably. The new Frankfurt Agreement takes these changes into account and aims to bring the harmonization ratio between international and European standards to an even higher level. In order to avoid duplication between de-derisation at international and European level, to the benefit of contributors and users of standards, as well as to improve the effectiveness of standardisation at European and international level, CEN and CENELEC have signed agreements with their respective international partners, the International Standards Organisation (ISO) and the International Electrotechnical Commission (IEC) on the rules of cooperation.