Excerpts from the report: Part I: The purpose of this paper is to present this simple approach to multiple curvilinear correlation. The method employed will be demonstrated with six examples, or cases, of actual problems chosen from different fields of economic relationships, in the hope that this “case” method of presentation will not only make clear the simple steps involved, but will also suggest their application to similar problems likely to be encountered by the analyst of variations in economic data. Part II: The simplified method of correlation already described in considerable detail elsewhere may be further illustrated by applying it to three additional problems dealing with actual changes in acreage, livestock numbers and yields. The cases selected for illustration deal with changes (a) in the United States acreage of cabbage, (b) in the total number of hogs on farms and (c) in the yield per acre of wheat in an eastern State.