This report looks at a comparison of swine production efficiency between the low and high profit producers in the Iowa Swine Enterprise Records Program for the year 1981 through 1986. The Swine Enterprise Record Program is coordinated by Emmett Stevermer through the Iowa State University Cooperative Ex tension service. It is a record keeping program with which cooperating hog producers,keep detailed records on their hog enterprises. The data provides information on average results for producers. It also provides a breakdown of how the top one-third as well as the low one-third producers performed. Producers were categorized by level of margin between pork production costs and returns.