[en] The study of the evolution of the N = 28 magic shell has been started about 15 years ago. A lot of experimental studies aimed at determining whether the N = 28 shell closure is eroded in very neutron-rich nuclei through complementary methods. The very first hints of the vanishing of the N = 28 gap were obtained by -βdecay [1], mass measurements [2] and Coulomb-excitation [3,4] experiments. Theoretical studies came progressively to the conclusion that the erosion of the N = 28 shell gap should lead to shape coexistence in 4^4S and deformation in 4^2Si (e.g. ). For this latter, it was however not clear whether spherical shape would be preferred to deformation. Recent experimental campaigns were carried out worldwide to study atomic masses [5], β-decay [6], nuclear spectroscopy [7,8,9,10,11,12], neutron single-particle energies [13] to probe the onset of collectivity along the N=28 isotones. With these pieces of information in hand and new unpublished results, the progressive collapse of the N = 28 shell closure is now established. Interestingly this study is also ideal for probing the nuclear forces such as the spin-orbit and tensor forces in nuclei. Experimental highlights will be shown at the N = 28 shell closure, in connection with the state of the art theoretical descriptions. More generally, the shell-breaking mechanism discovered at N=28 should apply to other shell closures, such as the N = 14, N = 50 and N = 82 ones, in which the same spin orbit forces are at play. However they seem to have various consequences with respect to shell erosion...(author)