Regarding Clause 188.8.131.52.1 Temporary change of process controls, based on my understanding, the main body is "process controls". And again, based on my understanding, SPC is a kind of process control, so are the Sampling Inspection and full inspection. However from a bestseller book about IATF16946 (of course it is not in English.), the author use a "process control temporary change management regulation" to address 184.108.40.206.1. This regulation should be implemented in the following situations: 1) temporary change to the processing method 2) temporary use of alternative equipment when key equipment fails 3) temporary use of alternative tooling or method when key tooling malfunctions 4) using the alternatives when inspection, measuring, test, fool-proof device fail, 5) temporary use of other alternative methods. If the above situations happen, the organization should go through the process stated in this regulation, notify the customer and ask for the consent. And after getting the consent, change all the relevant documentation and do other stuffs. My question ① is that in the original clause, just temporary change of process controls is mentioned. It is necessary that other situations above(1,2,3,5) need to be addressed in the manner as situation 4) is. What is more, I have also checked how it is done in my company. The triggering events are as bellows, 1) Incoming material from approved suppliers fails to conform to the requirements. Use the material from non-qualified suppliers. 2) due to equipment malfunction or/and increase of production demand, use non-designated equipment. 3) use alternative processing methods 4) other situation where deviation from requirements in CP happens. My question ② is that in my company`s case, whether the determined triggering events are appropriate or not. Looking forwards to your guys` opinions on this matter. Thanks.