  Starting with a minimal model for the CuO$_2$ planes with the on-site Hilbert
space reduced to only three effective valence centers [CuO$_4$]$^{7-,6-,5-}$
(nominally Cu$^{1+,2+,3+}$) with different conventional spin and different
orbital symmetry we propose a unified non-BCS model that allows one to describe
the main features of the phase diagrams of doped cuprates within the framework
of a simple effective field theory.
