What is the purpose of ISO 27004?

ISO 27004 specifically focuses on the metrics and measurements needed to assess the effectiveness of an Information Security Management System (ISMS). It provides guidance on how organizations can establish, implement, and continually monitor and improve their ISMS through the use of specific metrics and measurements. This is crucial for ensuring that the information security practices align with the objectives and requirements set forth in their information security policy and helps in providing evidence of compliance and effectiveness over time.

The emphasis on metrics is vital because it allows organizations to quantify their security efforts, evaluate their performance against predefined objectives, and identify areas needing improvement. By utilizing the recommendations from ISO 27004, organizations can better understand their security posture and make informed decisions to enhance their information security management processes.

While the other options address important aspects of security management (such as the protection of personal health information, policymaking, and incident response), they do not align with the specific focus of ISO 27004 on measuring the success of an ISMS through well-defined metrics.