When measuring the effectiveness of an Information Security Management System which one of the following would be MOST LIKELY used as a metric framework?

ISO/IEC 27004:2016 is the international standard that provides specific guidance on the monitoring, measurement, analysis, and evaluation of an Information Security Management System (ISMS). Its primary purpose is to help organizations assess the performance and effectiveness of their ISMS, as defined in ISO 27001. It establishes a framework for creating and using security metrics to ensure the ISMS is achieving its objectives.

A. ISO 27001 specifies the requirements for establishing and operating an ISMS, but it does not detail the framework for measuring its effectiveness.
B. PRINCE2 is a process-based method for effective project management and is not related to ISMS metrics.
D. ITILv3 is a framework for IT Service Management (ITSM) that focuses on aligning IT services with business needs, not ISMS measurement.

1. International Organization for Standardization. (2016). ISO/IEC 27004:2016 Information technology — Security techniques — Information security management — Monitoring, measurement, analysis and evaluation. ISO.org. See the standard's official introduction and scope sections.

2. von Solms, R., & von Solms, B. (2018). "Information Security Governance." In Cybersecurity, Springer, Cham. (pp. 27-50). This text discusses the ISO 27000 family, clarifying the role of 27004 in measurement (Section 3.4). https://doi.org/10.1007/978-3-319-95189-83