A PCI DSS compliance expert highlights the critical role of adhering to defined and periodic frequency requirements in maintaining security measures. Frequent reviews, such as every six months for network security control rule sets, are mandatory. Failure in compliance can lead to severe repercussions for organizations. Payment Card Assessments aids compliance through automation, education, and operation strategies, enhancing program effectiveness. Proper process implementation and training are essential for meeting PCI DSS standards and leveraging tools like the Requirement Frequency template enhances compliance management.