  We discuss the low-energy analysis of models involving quarks and
four-fermion couplings. The relation with QCD and with other models of mesons
and meson plus quarks at low energies is discussed. A short description of how
the heat-kernel expansion can be used to get regularization independent
information, is given. The anomaly within this class of models and a physical
prescription to obtain the correct flavour anomaly while keeping as much of the
VMD aspects as possible is discussed. The major part is the discussion within
this framework of the order $p^4$ action and of two and some three-point
functions to all orders in momenta and quark masses. Some results on hadronic
matrix elements are given.
