EN 1990 makes important assumptions about the way structures are designed and executed (see Figure 2.4).

It is assumed that people with appropriate qualifications, skill, and experience will choose the structural system, design the structure, and construct the works. It is also assumed that construction will be adequately supervised and quality controlled; and the structure will be adequately maintained and used in accordance with the design assumptions.

Because they vary from country to country, EN 1990 gives no guidance as to what 'appropriate' qualifications are needed to perform these tasks. Likewise 'adequate' supervision and control is not further defined in the Eurocode.

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