Selection processes are endemic in systems theories.
The most significant is the natural selection of Darwinian evolution, but in this context we can recognize natural selection outside of the context of biological evolution as any selection process which eliminates distinctions. Also included in the concept of selection are all forms of stability and equilibrium . Variation on its own, without further constraints, produces entropy or disorder, by diffusion of existing constraints or dependencies. However, variation is generally held in check by selection. Selection is the elimination or reduction of part of the variety of configurations produced by variation.