The best tool to monitor the effectiveness of information security governance is a Balanced Scorecard. A Balanced Scorecard is a performance management tool used to measure the success of an organization's information security governance. It is a strategic planning and management system that helps organizations track and measure the progress of their security initiatives by using a set of metrics across four areas: financial, customer, internal, and learning and growth. This helps organizations to assess their progress and adjust their security strategies to ensure they are meeting their desired objectives.