A series of Specifications (all parts of S-631) was prepared under a Joint Industry Project 35 (JIP35) by the ‘Offshore Structures Specifications Task Force’ organised by the International Oil & Gas Producers Association (IOGP) with support from the World Economic Forum (WEF). Recent trends in oil and gas projects have demonstrated substantial budget and schedule overruns. The Oil & Gas Community within the World Economic Forum (WEF) have implemented a Capital Project Complexity (CPC) initiative which seeks to drive a reduction in upstream project costs with a focus on industry-wide, non-competitive collaboration and standardisation. Further to the publication of the IOGP Operators’ Position and Key Messages on Standards (April 2017) and successful pilot study for IOGP JIP 33 Standardisation of Equipment Specifications for Procurement, the IOGP Offshore Structures Subcommittee discussed improving efficiency in this discipline by reducing or eliminating variation in requirements between operating companies and developing common operator requirements for offshore structures. The Offshore Structures Subcommittee established a Task Force (with administrative support funded by JIP35) to agree on the industry and/or international standard for each discipline and then develop minimum common requirements to improve efficiency and quality while reducing variation and cost.