 The common domain of the life sciences (which, according to Schurz, include biology, psychology as well as the social sciences and the humanities) are evolutionary systems or their products. Evolutionary systems are systems whose self-regulatory properties have been gradually selected according to their contribution to reproductive success. The temporal persistence of self-regulatory systems is governed by a certain range of prototypical norm states, in which these systems constantly have to be in order to stay alive. They manage this with the help of regulatory mechanisms which compensate for disturbing influences of the environment. Although the self-regulatory capacities of evolutionary systems are the product of a long adaptation history, they are not perfect. Dysfunctions may occur, whence their normic behavior may have various exceptions. Yet, it must be the case that these systems are in their prototypical norm states in the high statistical majority of cases and times, since otherwise, they would not have survived in evolution.