management laser infrastructure lean manufacturing process analysis subcontracting production schedule acceptance testing purchasing spare parts management scheduling coordinating sheet metal business process improvement installation welding track geometry supply chain management current source functional specification sap abap supply chain multitasking regression testing procurement engineering support business process incident management requisition catia quality assurance commissioning total productive maintenance purchase requisition accent reduction time study tool management outsourcing work measurement throughput change management quality circle production planning design tool planning stocks team management mapping service provider mills automation inventory management