1. Introduction.- 2. Properties of Total Dominating Sets and General Bounds.- 3. Complexity and Algorithmic Results.- 4.Total Domination in Trees.- 5.Total Domination and Minimum Degree.- 6. Total Domination in Planar Graphs.- 7. Total Domination and Forbidden Cycles.- 8. Relating the Size and Total Domination Number.- 9. Total Domination in Claw-Free Graphs.- 10. Total Domination Number versus Matching Number.- 11. Total Domination Critical Graphs.-...