What is the main purpose of a workfile according to the modified definition?

The main purpose of a workfile, according to the modified definition of the Uniform Standards of Professional Appraisal Practice (USPAP), is to contain supporting documentation for an assignment. A workfile encompasses all relevant data, analyses, and conclusions related to a specific appraisal assignment, thereby ensuring that the appraiser can substantiate their findings. This documentation serves as evidence that supports the appraiser's opinions and conclusions, and it must be maintained in a manner that demonstrates compliance with professional appraisal standards.

While aspects such as preserving all collected data, holding client correspondence, and ensuring compliance are important in the broader context of appraisal practice, the primary focus of the workfile is to provide a comprehensive foundation of support for the appraisal report itself. This includes any additional documents and analyses that back up the final conclusions, ensuring a clear and transparent process that can be reviewed if necessary.