2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35840We present the results of a study of the gauge dependence of spacetime perturbations. In particular, we consider gauge invariance in general, we give a generating formula for gauge transformations to an arbitrary order n, and explicit transformation rules at second order.6 pages, latex, with special style included, Proceedings of the 12th Italian Conference on General Relativity and Gravitational PhysicsGeneral Relativity and Quantum CosmologyAstrophysicstext