In my work I will try to mark out possible techniques for the construction of an update dynamic model, for a further computational of reverse exaction applying on a physical real model. This kind of research will be executed in different stages. All the steps required a deep understanding of dynamics with proper application of technical and analytical skills alongside a creative mind. In the first step a physical 3 story scaled framed structure model made with steel and aluminum materials was constructed. Every single element was measured to understand its volume and weight. This kind of information is useful for the computation of the mass matrix and the FEM model.