When analyzing control loop elements a distinction is drawn between dynamic response (response over time) and static response (steady-state response) of the element. If you consider, for example, the system's response to a step change of the input variable, commonly referred to as the step response (see the following graphic), a static response is characterised by steady end state x0 of the output variable, i.e. the respective value assumed by the system assumes after the transient response has faded.