The black box method is used to make the complexity of systems manageable. The system is considered as a black box by ignoring its inner structure. The control mechanism within the object under consideration is built into the overall system as a black box, unless one knows how it works or it is opaque. By considering the logical and statistical relationships between the input information (input) and the output variables (output), one tries to draw conclusions about the opaque or invisible control within the black box. This leads to a reduction of the manifold conceivable behaviors to a small selection. (Source: GPM)