Using planning steps for production planning

new planning methodology for coping with this uncertainty caused by disruptions is presented. Planning steps described by their preconditions and their consequences are used for material requirements planning and scheduling. Preconditions of planning steps have to be satisfied in a certain state of environment for the planning steps to be applicable. Consequences of planning steps change the state of environment. Each customer order establishes a goal of a new planning problem to be achieved by applying planning steps. Plan execution concerns all planning steps applicable in a certain state of environment. In choosing among applicable planning steps a heuristic is employed to preserve the flexibility of plan execution.