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This document describes: - two classification methods which may be used to determine the appropriate conformity assessment system for products (whereby one is based on calculated risk, the other on judgment of risk), processes and services; - a set of five conformity assessment systems from which the most suitable is chosen when conformity assessment of products, processes and services is required. German Working Committee NA 109-00-01 AA "Materialien, Ausrüstungen und Offshore-Bauwerke für die Erdöl-, petrochemische und Erdgasindustrie - Spiegelausschuss zu ISO/TC 67" ("Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries - Mirror Committee of ISO/TC 67") of the Petroleum and Natural Gas Industries Standards Committee (NÖG) of DIN, the German Institute for Standardization e. V, has participated in the preparation of the standard.