The finite element method, in conjunction with elasto-plastic constitu
tive laws, is able to give accurate estimates of collapse loads in geo
technical problems. The mechanisms of failure produced by these analys
es, however, are often diffuse and poorly defined, as compared with th
ose assumed in classical limit analysis techniques. This paper describ
es two methods for improving their visualization. It is shown that by
introducing a small degree of post-peak material softening into the co
nstitutive law, a considerably more localized mechanism is achieved. I
n contrast to previous attempts to ''trigger'' mechanisms whereby sele
ct elements were weakened, all elements are given the same constitutiv
e law in the present approach. A second method involves a re-gridding
approach, together with the use of incremental displacements. In this
approach, the displacement field is enhanced by interpolating between
the nodal values.