5 Steps to Optimal Integrity and Performance Page 15 There maybe equipment whose spares are interchangeable and this should be considered within the stock levels held. Geographical location should be considered where difficulties maybe experienced in importing material in a timely manner Attention should be paid to the interfaces of replacement components or assemblies as there maybe a specific requirement to replace consumables such as gaskets, o-rings etc. Where specific tooling for disassembly and installation of components is necessary but would not normally be available on-board, this should be considered as part of the kit of spares.