Does USPAP allow a reviewer to use extraordinary assumptions in a review assignment?

In a review assignment, USPAP does permit the use of extraordinary assumptions. An extraordinary assumption is a fact that is assumed to be true for the purpose of the analysis in situations where the appraiser lacks verification. In reviews, a reviewer may encounter situations where they must assess the validity of the appraiser's assumptions, which can include extraordinary assumptions.

The allowance for extraordinary assumptions is important as it helps ensure that reviewers can adequately evaluate the work done by the original appraiser. By using such assumptions, reviewers can analyze scenarios that may not have been fully substantiated or verified, while still maintaining a level of professionalism and adherence to standards.

It’s also worth noting that while extraordinary assumptions can be used, they should be explicitly stated, and the reviewer should consider their impact on the credibility and overall integrity of the appraisal being reviewed. This approach maintains transparency in the review process and aligns with the ethical guidelines set forth by USPAP.