4: Supplier/subcontractor process/product change are under control with ECN process in place which clearly defines the communication with customer for related changes and factory can only approve changes after get customer approval. Records available prove ECN process is effectively followed. 3: ECN process is not completely defined but factory should communicate with customer about changes and get approval in advance before accepting change was defined in process. No deviation was detected.2: Factory communicates with customer about changes and get approval in advance before accepting change is not defined in ECN process and/or some changes identified on site cannot be tracked back to communication with customer and approval from customer 1: ECN process is not defined and most of changes cannot be tracked back 0: Changes are implemented but not communicated with customer for approval in advance