  We briefly review the main aspects of leptogenesis, describing both the
unflavoured and the flavoured versions of the $N_2$-dominated scenario. A study
of the success rates of both classes of models has been carried out. We comment
on these results and discuss corrective effects to this simplest scenario.
Focusing on the flavoured case, we consider the conditions required by strong
thermal leptogenesis, where the final asymmetry is fully independent of the
initial conditions. Barring strong cancellations in the seesaw formula and in
the flavoured decay parameters, we show that strong thermal leptogenesis
favours a lightest neutrino mass $m_1\gtrsim10\,\mbox{meV}$ for normal ordering
(NO) and $m_1\gtrsim 3\,\mbox{meV}$ for inverted ordering (IO). Finally, we
briefly comment on the power of absolute neutrino mass scale experiments to
either support or severely corner strong thermal leptogenesis.
