Defining default behavior

The default behavior is the system behavior when the state or procedure are not in the design scope.

Typical default behavior may be alerting, reporting, and additional actions, specific to an application

The default behavior in stationary systems may be shut down.
In particular, the default behavior in nuclear power plants may include SCRAM.
The default behavior in sea transportation may be engine shut down.
The default behavior in air transportation may be automatic reset in manual mode.