Which type of reports require a signed certification according to USPAP?

A signed certification is essential for all types of appraisal reports, which include both oral and written formats, as mandated by the Uniform Standards of Professional Appraisal Practice (USPAP). The certification serves to affirm that the appraiser has adhered to the applicable standards and has acted with integrity in their evaluation process. This requirement is in place to bolster the credibility and reliability of the appraisals, ensuring that users of the reports can trust the appraiser's expertise and accountability.

When appraisers produce reports, whether written or presented orally, the signed certification provides a formal acknowledgment of their professional responsibilities and obligations. This standardity is crucial for maintaining consumer trust and professional integrity in the appraisal industry. Thus, selecting the option indicating that all oral and written reports require a signed certification aligns perfectly with the principles set forth by USPAP.