When measuring the effectiveness of an Information Security Management System which one of the following...

 Metric Framework for ISMS:

ISO 27004 provides specific guidelines for monitoring, measuring, analyzing, and evaluating the effectiveness of an Information Security Management System (ISMS).

 Purpose of ISO 27004:

It complements ISO 27001 by focusing on performance metrics and continuous improvement.

 Supporting Reference:

CCISO materials emphasize the importance of metrics and continuous evaluation frameworks like ISO 27004 for ensuring ISMS effectiveness.