When all components have been analysed, a review must take place. All analysts must participate in this review. The purpose of the review is to detect mistakes and inconsistencies, and to decide whether the Single Failures Analysis stage can be concluded.
If any of the components has an overall vulnerability level of Ambiguous or Unknown, the analysts must decide whether or not to conduct further investigation, in order to assess the vulnerabilities to that node with greater certainty. If the analysts think that the effort involved is too large, or that it will not lead to more accurate or insightful results then the component should be left as is.
If the analysts decide to redo some part of the Single Failures Analysis stage, then they should again perform a review afterwards. This review may be omitted when the analysts agree that all changes are minor.