What causes backflow?

Backflow is possible in two situations, backsiphoning and backpressure.

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1. What is backflow?
2. What causes backflow?
3. What is backsiphoning?
4. What is backpressure?
5. How can backflow be prevented?
6. What is a backflow assembly?
7. How is an assembly approved?
8. Who is required to have a backflow prevention assembly?
9. How do I know if I need a backflow prevention assembly?
10. Is there a general compliance schedule and process?
11. Who installs the backflow prevention assembly?
12. Where should a backflow prevention assembly be located?
13. Who is responsible for the testing and maintenance of the backflow assembly?
14. Who is BSI, and how do I contact them to submit test results?