1. Structural and Bonding Features of Metallaboranes and Metallacarboranes -- 2. Transition-Metal Derivatives of Nido-Boranes and Some Related Species -- 3. Interactions of Metal Groups with the Octahydrotriborate (1?) Anion, B3H8? -- 4. Metallaboron Cage Compounds of the Main Group Metals -- 5. closo-Carborane-Metal Complexes Containing Metal-Carbon and Metal-Boron ?-Bonds -- 6. Electrochemistry of Metallaboron Cage Compounds -- 7. Boron Clusters with Transition Metal-Hydrogen Bonds.