KRIs provide predictive metrics to monitor changes in risk levels, enabling timely interventions to maintain risks within the organization's appetite. This aligns with theRisk Monitoring and Reportingframework, which emphasizes proactive identification of risk thresholds.

The best way to ensure that information system controls are effective is to test them periodically. Testing controls periodically helps to verify that the controls are operating as intended, and that they are aligned with the enterprise's objectives, policies, and standards. Testing controls periodically also helps to identify any gaps, weaknesses, or deficiencies in the controls, and to implement corrective actions or improvements.
Responding promptly to control exceptions, implementing compensating controls, and automating manual controls are good practices, but they are not the best way to ensure control effectiveness. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 3, Section 3.1.1.2, page 1071
1: ISACA Certified in Risk and Information Systems Control (CRISC) Exam Guide, Answer to Question
641.

A risk assessment indicates the residual risk associated with a new bring your own device (BYOD) program is within organizational risk tolerance. This means that the potential benefits of BYOD outweigh the potential risks, and that the controls in place are adequate to mitigate those risks.
The next step for the risk practitioner is to identify log sources to monitor BYOD usage and risk impact. Log sources are records of events or activities that occur in a system or network, such as file access, network traffic, user behavior, etc. Log sources can provide valuable information about how BYOD devices are used, what data they access, what applications they run, what threats they encounter, etc.
By monitoring log sources, the risk practitioner can track and measure the actual performance and security of BYOD devices, compare them with the expected outcomes and standards, identify any deviations or anomalies that may indicate a breach or a vulnerability, and take appropriate actions to address them.
Therefore, identifying log sources to monitor BYOD usage and risk impact is a recommended action after a successful risk assessment.
The references for this answer are:
Risk IT Framework, page 10
Information Technology & Security, page 4
Risk Scenarios Starter Pack, page 2

The likelihood rating in the risk register is a measure of how probable it is that a risk event will occur, given the current conditions and controls. The risk practitioner should change the likelihood rating if there is a significant change in the effectiveness of the controls that are implemented to prevent or reduce the risk. For example, if a control becomes obsolete, ineffective, or bypassed, the likelihood rating should increase, as the risk event becomes more likely to happen. Conversely, if a control becomes more efficient, reliable, or robust, the likelihood rating should decrease, as the risk event becomes less likely to happen. The other options are not likely to cause a change in the likelihood rating, as they are not directly related to the probability of the risk event. Risk appetite is the amount of risk that an organization is willing to accept in pursuit of its objectives. Control cost is the amount of resources that are required to implement and maintain a control. Risk tolerance is the acceptable level of variation that an organization is willing to allow for a risk to deviate from its desired level or expected outcome. These factors may influence the risk response or the risk acceptance, but not the likelihood rating. References = Risk and Information Systems Control Study Manual, Chapter 1:
IT Risk Identification, Section 1.4: Risk Register, p. 25-26.

Information systems control deficiencies are the weaknesses or flaws in the design or implementation of the controls that are intended to ensure the confidentiality, integrity, availability, and reliability of the information systems and resources. Information systems control deficiencies may reduce the effectiveness or efficiency of the controls, and expose the organization to various risks, such as unauthorized access, data loss, system failure, etc.
Reviewing results from control self-assessment (CSA) is the best way to identify information systems control deficiencies, because CSA is a process of evaluating and verifying the adequacy and effectiveness of the information systems controls, using the input and feedback from the individuals or groups that are involved or responsible for the information systems activities or functions. CSA can help the organization to identify and document the information systems control deficiencies, and to align them with the organization's information systems objectives and requirements.
CSA can be performed using various techniques, such as questionnaires, surveys, interviews, workshops, etc.
CSA can also be integrated with the organization's governance, risk management, and compliance functions, and aligned with the organization's policies and standards.
The other options are not the best ways to identify information systems control deficiencies, because they do not provide the same level of detail and insight that CSA provides, and they may not be relevant or actionable for the organization.
Vulnerability and threat analysis is a process of identifying and evaluating the weaknesses or flaws in the organization's assets, processes, or systems that can be exploited or compromised by the potential threats or sources of harm that may affect the organization's objectives or operations. Vulnerability and threat analysis can help the organization to assess and prioritize the risks, and to design and implement appropriate controls or countermeasures to mitigate or prevent the risks, but it is not the best way to identify information systems control deficiencies, because it does not indicate whether the existing information systems controls are adequate and effective, and whether they comply with the organization's policies and standards.
Control remediation planning is a process of selecting and implementing the actions or plans to address or correct the information systems control deficiencies that have been identified, analyzed, and evaluated.
Control remediation planning involves choosing one ofthe following types of control responses: mitigate, transfer, avoid, or accept. Control remediation planning can help the organization to improve and optimize the information systems controls, and to reduce or eliminate the information systems control deficiencies, but it is not the best way to identify information systems control deficiencies, because it is a subsequent or follow-up process that depends on the prior identification of the information systems control deficiencies.
User acceptance testing (UAT) is a process of verifying and validating the functionality and usability of the information systems and resources, using the input and feedback from the end users or customers that interact with the information systems and resources. UAT can help the organization to ensure that the information systems and resources meet the user or customer expectations and requirements, and to identify and resolve any issues or defects that may affect the user or customer satisfaction, but it is not the best way to identify information systems control deficiencies, because it does not focus on the information systems controls, and it may not cover all the relevant or significant information systems control deficiencies that may exist or arise. References = ISACA, CRISC Review Manual, 7th Edition, 2022, pp. 40-41, 47-48, 54-55, 58-59, 62-63 ISACA, CRISC Review Questions, Answers & Explanations Database, 2022, QID 186 CRISC Practice Quiz and Exam Prep