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and Security.

Practically, applying security measures to the appliances of a system generally improves the dependability by limiting the number of externally originated errors.

Threats

Threats are things that can affect a system and cause a drop in Dependability. There are three main terms that must be clearly understood:

* Fault: A fault (which is usually referred to as a bug for historic reasons) is a defect in a system. The presence of a fault in a system may or may not lead to a failure. For instance,

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