The Uniform Standards of Appraisal Practice (USPAP) created by the Appraisal Foundation’s Appraisal Standards Board is updated every two years, and the 2020-2021 version is available for purchase at the Appraisal Foundation’s website, appraisalfoundation.org. In addition, the Appraisal Foundation created a three-page summary of the changes as well as a detailed 128-page preview of all revisions. Both summaries are available free online at the Appraisal Foundation’s website.