A methodology has been developed to simultaneously treat phenomena at
several scales. The key features of the method are (i) a detailed erro
r diagnosis which identifies critical regions, and (ii) a feedback pro
cedure which overlays portions of the finite element mesh, where unacc
eptable errors have been identified. by local finite element mesh(es),
and then subsequently improves the quality of the solution in the glo
bal and local response until the desired level of accuracy is achieved
. The method can be routinely used as a global-local method and/or as
an adaptive technique which provides a measure of reliability of globa
l and local computations. Numerical experiments for problems in homoge
neous and heterogeneous (laminated composites) media are presented to
validate the present formulation,