1. A system for handling a production disturbance/opportunity event in a production execution system, comprising: a network comprising a number of data processing units running a MES software for at least one of controlling and monitoring a production process operating a number of production components; a production modeler within the MES software enabled to define a plant model of the production process; a production scheduler within the MES software enabled to generate an executable production schedule for the execution of operating procedures for the production components related to the plant model of the production process; a production executor within the MES software enabled to execute the production process following the generated executable production schedule; and a production disturbance/opportunity event identifier within the MES software being enabled to detect a production disturbance event and to identify a production opportunity event which allows to maintain an efficiency of the production process at least as close as possible to an efficiency given by the executable production schedule as originally generated by the production scheduler; wherein the production scheduler is further configured to re-calculate an amended executable production schedule incorporating the identified production opportunity event, and wherein the production executor is further enabled to execute the production process now following the re-calculated executable production schedule.