1. The client will give you a list before the audit. You can prepare system documents, table records and other materials in advance according to the contents of the list, so as to be aware of it. This is the so-called self-assessment. 2. When the customer asks questions, if there is information, take it out. The actual thing is more important than any answer, because what customers value most is the execution of your company. 3. If there is really no information to take out, then tell the direction of improvement in the future. No matter whether the customer is right or wrong, don't argue with the customer. 4. The information that customers need is generally your company's ISO system documents and the operation information of various departments. It mainly includes the following parts: a. Management system manual policy, objectives, organization chart, quality assurance system flow chart (document control) b. Training materials, training plans, attendance sheets, examination papers, employment certificates (administration) c. Internal audit and management review plans, implementation records (document control) d. Order review materials (business) e.QC engineering drawings. F supplier management data, supplier inspection plan, evaluation records, monthly assessment records (quality assurance, procurement) g inspection standards, inspection records, instrument calibration records (quality assurance) h 5S of warehouse and production site, identification, regional division (warehouse, production) i. nonconforming product processing flow chart and abnormal improvement data (products) are right, but BS does not understand.