1.  Introduction

2.  Direct abundance determinations

   2.1  Temperature structure
   2.2  Ionic abundances
   2.3  Abundance results
     2.3.1  Spatial uniformity
     2.3.2  Search for self-enrichment
     2.3.3  Spatially integrated abundances and LMC metallicities

3.  Semi-empirical bright-line methods

    3.1  R23
    3.2  S23
    3.3  S234
    3.4  Calibrations

4.  Conclusion