During which phase of the Plan-Do-Check-Act cycle do organizations maintain and improve the information security...

The “Act” phase is the phase in which an organization maintains and improves the information security management system. In the PDCA logic, “Plan” establishes objectives, policies, processes, risk treatment plans, and controls. “Do” implements and operates the planned processes and controls. “Check” monitors, measures, audits, and reviews performance. “Act” uses the results of checking to correct weaknesses, improve effectiveness, and adapt the ISMS to changing conditions. ISO/IEC 27002 is not itself the PDCA requirements standard, but its controls support the management system lifecycle used by ISO/IEC 27001. Examples include independent review of information security, compliance review, learning from incidents, management of vulnerabilities, and change management. These controls generate findings and lessons that feed improvement actions. “Do” is not the best answer because it focuses on implementation. “Check” is not the best answer because it evaluates performance but does not itself complete improvement. The phase that maintains and improves the ISMS is “Act.” References/Chapters: ISO/IEC 27002:2022, Control 5.35 Independent review of information security; Control 5.27 Learning from information security incidents; ISO/IEC 27001 PDCA-based management system model.

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