  During the last decade there has been an increase on the use of goal-oriented
error estimates which help to quantify and control the local error on a
quantity of interest (QoI) that might result relevant for design purposes (e.g.
the mean stress or mean displacement in a particular area, the stress intensity
factor for fracture problems,...). Residual-based error estimators have been
used to estimate the error in quantities of interest for finite element
approximations. This work presents a recovery-based error estimation technique
for QoI whose main characteristic is the use of an enhanced version of the
Superconvergent Patch Recovery (SPR) technique developed by Zienkiewicz and
Zhu. This enhanced version of the SPR technique, used to recover the primal and
dual solutions, provides a nearly statically admissible stress field that
results in accurate estimations of the error in the QoI.
