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This review is not a compendium of strong-line methods to derive abundancesin giant HII regions. It is mostly intended for readers who wish to use suchmethods but do not have a solid background on the physics of HII regions. It isalso meant to encourage those using abundance results published in theliterature to think more thoroughly about the validity of these results.

Can we believe the strong-line abundances in giant HII regions and emission-line galaxies?