Summary: The finite element model updating process developed at ONERA is based on the minimisation of input errors in the dynamic equilibrium equations. The reaction forces due to incorrect stiffness or mass matrix of the model are used to localise the predominant errors and, afterwards, to find correcting parameters, in order to have a prediction model as close as possible to the real structure. We present the recent evolution of the method with numerical applications to an axisymmetric composite structure and to a truss system.