Usually, an important principle associated with regulatory control
is that system operators have the undivided responsibility for
safety. Although regulatory strategies vary, it is usual that a regulator
gives freedom regarding exactly how specific regulations
should be satisfied. In control theoretical terms, the norms may
be underspecified with respect to what specific control actions that
should be used, provided that the control actions (and the control
structure) keep the system into the desired states (usually provided
by the norms).