➢ At the beginning of production or when the material is put on line - first inspection ➢ Worker for mass production products - self and mutual inspection ➢ During the production process, IPQC of the quality department and production area foreman inspect each process of the process - Some processes in the production process inspect all semi-finished products - Transfer inspection is required when the process is transferred - The next receiving department confirms the receipt of the products sent by the previous process group.