  The Kohn-Sham method uses a single model system, and corrects it by a density
functional the exact user friendly expression of which is not known and is
replaced by an approximated, usable, model. We propose to use instead more than
one model system, and use a greedy extrapolation method to correct the results
of the model systems. Evidently, there is a higher price to pay for it.
However, there are also gains: within the same paradigm, e.g., excited states
and physical properties can be obtained.
