2. Find suitable suppliers, communicate with them and get some basic information.

3. product audit, or we can ask for a sample to see if we can make the products we need. Make sure to go to the next step.

4. Preparation, implementation, evaluation and summary of system audit and process audit.

5. Submit the audit report to the authorized manager for approval. Approve the adoption and import of AVL, and approve the rejection and redevelopment of other things.