For critical components that undergo dynamic loading a structural integrity assessment is necessary. An analytical strength assessment enables enough accurate design of structural components already at an early stage. But it is not only a question of the applied calculation method. It also involves accurate load assumptions, fatigue analysis, quality aspects as well as certain design suggestions. In this contribution, we present the requirements of (railway) industry on structural integrity assessment of vibrating components and discuss requirements of each individual step of EN 13749 structural validation plan for design release. Achieving the goals is even more challenging in case of vibrating components. Comparison in requirements and procedure is presented in case of “non- vibrating” standard components (stiff and compact parts) and “vibrating” attachment components (soft and overhanging parts). Overall aim of this contribution is not only to demonstrate certain needs of industry, but also to present some important aspects in the field of fatigue. Nevertheless, new innovative methods are needed that can fulfil standard requirements and are appropriate for everyday use.