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The correlations between planetary nebula (PN) morphology and the nature oftheir progenitors are explored by examining homogeneous PN samples in theGalaxy and the Magellanic Clouds. We selected PNe with reliable abundances fromspectral analysis, and whose morphology is known, and compared the abundancesof the element at variance with stellar evolution with the final yields ofAsymptotic Giant Branch (AGB) stellar models. We found that most asymmetric PNederive from the evolution of massive AGB stars both in the Galactic disk andthe Magellanic Clouds.

Revealing the Nature of Asymmetric Planetary Nebulae through Abundance Analysis