6.4 - Follow change control processes and procedures for all changes to system components., 6.4.1 - Separate development/test environments from production environments, and enforce the separation with access controls., 6.4.2 - Separation of duties between development/test and production environments, 6.4.3 - Production data (live PANs) are not used for testing or development, 6.4.4 - Removal of test data and accounts from system components before the system becomes active / goes into production., 6.4.5 - Change control procedures must include the following, 6.4.5.1 - Documentation of impact., 6.4.5.2 - Documented change approval by authorized parties., 6.4.5.3 - Functionality testing to verify that the change does not adversely impact the security of the system., 6.4.5.4 - Back-out procedures., 6.4.6 - Upon completion of a significant change, all relevant PCI DSS requirements must be implemented on all new or changed systems and networks, and documentation updated as applicable.,

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