An approach to organizing the calculation of the efficient score for a fini
te dimensional parameter of interest in the presence of an infinite dimensi
onal nuisance parameter is presented. The approach involves choosing a set
of submodels for the nuisance parameter. The condition that the scores for
the submodels be orthogonal to the efficient score takes the form of an equ
ation whose solution appears in a representation of the efficient score. Th
e approach is illustrated with several examples.