26Under Article 42(3) of that directive, the technical specifications can be formulated in several ways, either in terms of performance or functional requirements, or by reference to technical specifications, and, in order of preference, to national standards transposing European standards, European Technical Assessments, common technical specifications, international standards, other technical reference systems established by the European standardisation bodies or — when any of those do not exist — national standards, national technical approvals or national technical specifications relating to the design, calculation and execution of the works and use of the supplies, or a combination of both ways.
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