The risk register is a document that records the identified risks, their analysis, and their responses. It is a useful tool for monitoring and controlling the risks throughout the project lifecycle. However, the risk register is not a static document and it should be updated regularly to reflect the changes in the risk environment and the project status. Therefore, when reviewing therisk register, a risk practitioner should not only look at the risk ratings, but also the assumptions and the rationale behind them. Different business units may have different perspectives, contexts, and data sources for the same risk scenario, which can result in significant variances in inherent risk. Inherent risk is the risk level before considering the existing controls or responses. Therefore, the best course of action is to review the assumptions of both risk scenarios to determine whether the variance is reasonable or not. This can help to identify any errors, inconsistencies, or biases in the risk assessment process, and to ensure that the risk register reflects the current and accurate state of the risks. References = Risk and Information Systems Control Study Manual, Chapter 3, Section 3.2.1, p. 106-107