  We discuss the possibility of relating the size and sign of the observed
baryon asymmetry of the universe to CP violation observable at low energies, in
a framework where the observed baryon asymmetry is produced by leptogenesis
through out of equilibrium decay of heavy Majorana neutrinos. We have shown
that although in general such a connection cannot be established, there are
specific frameworks where a link does exist. Furthermore, we identify the CP
violating phases relevant to leptogenesis and those relevant for low energy CP
violation and build weak basis invariant conditions for CP conservation.
