  The growth of Super Massive Black Holes and the parallel development of
activity in galactic nuclei are implemented in an analytic code of hierarchical
clustering. The evolution of the luminosity function of quasars and AGN will be
computed with special attention paid to the connection between quasars and
Seyfert galaxies. One of the major interests of the model is the parallel study
of quasar formation and evolution and the History of Star Formation.
