Planetary nebulae: their evolution and role in the universe issue:209 pages:91-98
Planetary Nebulae: their evolution and role in the Universe location:Canberra date:19-23 November 2001
In this contribution an overview is given of recent accurate chemical abundance studies in post-AGB stars. The intrinsic nature of the enrichement and the spread in metallicity together with the absence of strong molecular veiling make post-AGB stars very useful to constrain AGB (chemical) evolutionary models. S-process enrichment is, however, not a general characteristic of post-AGB stars and a photospheric chemical study is not always a good tracer for the evolved status of an object.