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The purpose of this workshop is to gather scientists and students to address crucial questions related to the chemical abundances in gaseous nebulae. We plan to cover all major theoretical and observational aspects of the study of chemical abundance in HII regions and Planetary Nebulae as well as in Active Galactic Nuclei. For four days, extensive discussion about specific issues in the areas covered by the workshop will be provided. During the workshop will be celebrated the 50th anniversary of the seminal paper Peimbert & Costero (1969, BOTT, 5, 3). In particular, the topics to cover will be: - Abundance discrepancy in HII regions and Planetary Nebulae. - Methods to determine the chemical abundance in gaseous nebulae. - Ionization correction factors of HII regions and Planetary Nebulae - Abundance determinations in objects at high redshift - Implications of chemical abundance in gaseous nebulae on galaxy evolution - Ultraviolet, optical and infrared spectroscopy of gaseous nebulae - Abundance determinations in AGNs - Atomic parameters - Implications of new telescope generations on chemical abundance determinations of Gaseous Nebulae