Factors that affect the production control are failures of machines or missing staff, the fluctuating energy price and the current job situation. The adaption of the behaviour of the production system is conducted by a change of the structure (e.g. changing the order of the process steps) or by changing the machine parameters (e.g. variants of CNC programs). The realisation of a self-optimising production control enables permanent consideration of the current production situation and thus an optimised distribution of jobs on the machines (e.g. lathe, milling machine) at any time. In this paper the design of a self-optimising production control is described using the specification technique CONSENS (CONceptual design Specification technique for the Engineering of mechatronic Systems). The description is structured in several interrelated aspects, e.g. environment or application scenarios. The aspects are computer-internally represented by partial models. The specification provides a holistic discipline-spanning description of a self-optimising production control.