It is not uncommon for large-scale safety-related engineering projects to make use of legacy systems that are either reused as is, or reused with modifications. Projects of this type can require the use of independent assessment as part of the regulatory approval process. Providing an independent assessment of such a project brings with it particular challenges related to issues of cross-acceptance, of the value of historical operational claims, and of supply chains involving international organisations sometimes with their own independent assessors. In this paper the various characteristics of large-scale engineering projects are outlined, together with their impact on an independent assessor. Lessons for independent assessors are identified.
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