Invited_talk abstract details

We review gas-phase abundances in PNe, and describe their dual utility as
archives of original progenitor metallicity via the alpha elements, as well
as sources of processed material from nucleosynthesis during the star¹s
evolution, i.e., C, N, and s-process elements. Observational methods,
including analysis tools and computer modeling, are discussed, along with
the status of recombination-line vs. forbidden-line abundance
determinations. We also summarize results from a recent collaborative
comparison with several abundances research groups. Finally, we suggest
areas where more work is needed to improve our abilities to determine
abundances in PNe.