This International Standard provides requirements and guidance for the structural design and/or assessment of floating offshore platforms used by the oil and gas industry to support the following functions: . production; . storage and offloading; . drilling and production; . production, storage and offloading; . drilling, production, storage and offloading. The provisions of this International Standard do not apply to the structural systems of Mobile Offshore Units (MOUs). These include, among others: . floating structures intended primarily to perform drilling and/or well intervention operations (often referred to as MODU). . floating structures used for offshore construction operations (e.g. crane barges or pipelay barges), for temporary or permanent offshore living quarters (floatels), or for transport of equipment or products (e.g. transportation barges, cargo barges). For these structures, reference is made to relevant RCS rules.