2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34867A set of world-line deviation equations is derived in the framework of Mathisson-Papapetrou-Dixon description of pseudo-classical spinning particles. They generalize the geodesic deviation equations. We examine the resulting equations for particles moving in the space-time of a plane gravitational wave.5 pages, no figures, to appear in Physics Letters BGeneral Relativity and Quantum Cosmologytext