1. What is debris flow? -- 2. Models for mechanics of flow -- 3. Initiation, development and declination of debris flow -- 4. Characteristics of fully-developed debris flow -- 5. Processes and geomorphology of deposition -- 6. Sediment runoff models that include debris flow processes -- 7. Debris flow disasters and their reproduction by computer simulations -- 8. Countermeasures for debris flow disasters.