Excerpt from the report Summary: This study was made for the purpose of determining the accuracy of visual appraisals for wool grades, for clean wool yield, and for staple length. Its purpose was also to test the accuracy of sampling and testing methods used to estimate grade and yield. To accomplish these aims, visual appraisals of grade and yield, made by Government appraisers and a committee of trade representatives, were compared with the actual wool top resulting from the processing of the grease wool appraised.