Nevertheless, the Vienna Agreement allows CEN or ISO to carry out standardisation activities on the same subject if deemed necessary. The Joint ISO-CEN Coordinating Group of the Technical Boards has an important strategic role to play in monitoring the implementation of the Vienna Agreement and in advising the CEN Senior Technical Council and the ISO Technical Management Committee on all matters related to the Vienna Agreement, including the need for revisions. In September 2001, a revised version (version 3.3) of the Vienn Agreement was published, in which the agreement itself was reduced to the essential principles of cooperation BETWEEN ISO and CEN. Overall, the current version gives priority to international standardization and gives ISO management greater importance than previous versions. For example, EN-ISO standards can only be revised under the guidance of ISO, regardless of their origin. In 1996, CENELEC and the IEC signed the Dresden Agreement in order to create the necessary framework for an intensive consensus process between European and international standardization activities in the electricity sector. The technical cooperation agreement between ISO and CEN (Vienna Agreement) is a technical cooperation agreement between ISO and the European Committee for Standardization (CEN). It was formally approved by the CEN Management Board on 27 June 1991 in Vienna, after approval by the ISO Executive Board in Geneva on 16 and 17 May 1991, and replaced the Agreement on the Exchange of Technical Information between ISO and CEN (Lisbon Agreement), concluded in 1989. The “codified” Viennese agreement was approved in 2001 by the ISO Council and the CEN Board of Directors. In October 2016, at the CIS Annual General Meeting in Frankfurt, the IEC, which publishes the vast majority of international standards for electrical and electronic appliances and systems, and CENELEC, their counterpart at European level, signed the Frankfurt Agreement, which will strengthen harmonization between international and European standards. In order to avoid duplication between standardisation at international and European level, to the benefit of standard contributors and users, 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 Organisation for Standardisation (ISO) and the International Electrotechnical Commission (IEC). definition of the rules of cooperation. .