Payroll system risk mitigation plans are the actions that are taken to reduce or eliminate the risk associated with payroll processing. When a migration from an in-house developed system to an external cloud-based solution is affecting a previously rated key risk scenario related to payroll processing, the first part of the risk register that should be updated is the payroll system risk mitigation plans. This is because the migration may introduce new risks or change the existing risks, and the risk mitigation plans may need to be revised or replaced accordingly. Updating the payroll system risk mitigation plans can help ensure that the risk level is acceptable and the payroll process is secure and reliable. According to the CRISC Review Manual 2022, one of the key risk treatment techniques is to update the risk action plan, which is a document that outlines the risk mitigation plans1. According to the CRISC Review Questions, Answers & Explanations Manual 2022, updating the risk mitigation plans is the correct answer to this question2.

Payroll system risk factors, payroll process owner, and payroll administrative controls are not the first part of the risk register that should be updated when a migration is affecting a key risk scenario. Payroll system risk factors are the sources or causes of risk, such as threats, vulnerabilities, or uncertainties. Payroll process owner is the person who is responsible for the payroll process and its outcomes. Payroll administrative controls are the policies, procedures, or guidelines that govern the payroll process. These parts of the risk register may also need to be updated, but they are not as urgent or critical as the risk mitigation plans. Updating the risk factors, process owner, and administrative controls can help identify, assess, and monitor the risk, but they do not directly address the risk response. The risk response is the most important part of the risk management process, as it determines how the risk is handled and controlled.