The first phase establishes item masters, units, locations, bills, routings and opening inventory. A representative product family then proves order release, material issue, reporting, inspection and close from end to end. Running a narrow slice exposes master-data and costing problems before they affect the whole plant.
Later waves add scheduling, maintenance, advanced quality and supplier collaboration, plant by plant or value stream by value stream. Cutover plans account for open purchase orders, partly completed work, quarantined stock and transactions entered during the count. Ownership passes to operational teams through role-specific procedures and controlled configuration.