The full name of COC service is Customer Originated Change (COC), acustomer-initiated change service, which is a customer-based operationandmaintenance technical publication change service implemented by the mainmanufacturer caused by the customer's own product configuration change.

COC change service is to change the customer change manual originally undertaken by the customer to the main manufacturer for paid maintenance. After the customer provides the product information required to be included inthe manual to the main manufacturer, the main manufacturer will revise the process maintenance manual according to the COC of the manual and distribute it to the customer.