Traditional planning approaches in production involve the creation of schedules prior to beginning of the production process. In this case, uncertainties that are not expected nor taken into account at the planning phase can cause delays of these schedules. Common uncertainties that occur in a manufacturing system include machine operator absence, material shortages, and machine failure. In such scenarios, the manager has to react by manually selecting a new or revised schedule to ensure that production continues while maintaining the required performance level. All these challenges lead to poor utilization of resources, delays in deliveries and sometimes chaos in production. The innovation of real-time planning is to address the shortcomings of the traditional approaches by performing scheduling concurrently with the production process.