A function is known in biological systems as something done to a system through causation and evolution. In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output.
If we take as an example nitric oxide (NO) the molecule is known as a regulator and mediator of numerous processes in nervous, immune and cardiovascular systems. Because it has a wide variety of functions that extremely important in supporting life it was named the "Molecule of the Year" in 1992.
Studies performed in living organisms are not much different than studies performed in processes within the business environments. Each function in nature is a result of an evolutionary process that leads to sustainability and live support. If we consider that Lean represents the bond between diverse processes while through statistics we can interpret future opportunities for evolution as well as probabilistic determination of causation and its effects, we can draw the conclusion that processes are intrinsically connected to business evolution.