Key performance indicators (KPIs) are the most effective for communicating forward-looking trends within security reporting. KPIs are metrics used to measure progress towards a specific goal or objective, and can provide insight into the current state of security and any potential issues or risks that may arise in the future. Key control indicators (KCIs), key risk indicators (KRIs), and key goal indicators (KGIs) are all important for measuring security performance and identifying areas for improvement, but KPIs are the most effective for communicating forward-looking trends.
Reference that support this statement include:
"Key Performance Indicators (KPIs) for IT Security" by ISACA. This resource states that KPIs "can be used to measure the performance of security controls and identify trends in security risks."
"Measuring and Managing Information Risk: A FAIR Approach" by The Open Group. This guide states that "KPIs are used to track progress over time and to identify areas where improvements may be needed."
"Key Performance Indicators (KPIs) for Cyber Security" by SANS Institute. This resource states that "KPIs can be used to identify potential risks and measure the effectiveness of security controls.

The BEST practice for ensuring the integrity of the recovered system after an intrusion is to restore the OS, patches, and application from a backup. This will ensure that the system is in a known good state, without any potential residual malicious code or changes from the intrusion. Restoring from a backup also enables the organization to revert to a previous configuration that has been tested and known to be secure. This step should be taken prior to conducting a thorough investigation and forensic analysis to determine the cause and extent of the intrusion.

An organization's information security strategy should be aligned with its risk tolerance, which is the level of risk that an organization is willing to accept in pursuit of its objectives. The strategy should aim to balance the cost of security controls with the potential impact of security incidents on the organization's objectives. Therefore, an organization's risk tolerance has the greatest influence on its information security strategy.
The organization's risk tolerance has the greatest influence on its information security strategy because it determines how much risk the organization is willing to accept and how much resources it will allocate to mitigate or transfer risk. The organizational structure, industry security standards, and information security awareness are important factors that affect the implementation and effectiveness of an information security strategy but not as much as the organization's risk tolerance.
An information security strategy is a high-level plan that defines how an organization will achieve its information security objectives and address its information security risks. An information security strategy should align with the organization's business strategy and reflect its mission, vision, values, and culture. An information security strategy should also consider the external and internal factors that influence the organization's information security environment such as laws, regulations, competitors, customers, suppliers, partners, stakeholders, employees etc.