  We have analyzed the behaviour of various parameters of PNe in the Magellanic
Clouds (MCs) and the Galaxy as a function of their morphology. The luminosity
function of different morphological types has been built, finding that
elliptical and round PNe dominate the bright cutoff both in the MCs and in the
Galaxy. The dependence of the [OIII] absolute magnitude on chemical abundances
has been investigated.
