In the language of PCM theory for correlated wave functions, the equilibrium state-relaxed approach just described has some similarity to the most complete version of the SCRF procedure, which is often called "pertur-bation to energy and density", insofar as all correlation effects are fully included in the charge density that is used to equilibrate the reaction field. Some differences exist insofar as RAS-SF is not a post-Hartree-Fock correlation procedure where correlation is added to a single-determinant reference, but rather it is a method in which the ground-state wave function emerges as the lowest eigenfunction of a CI Hamiltonian.