In this testimony before the U.S. House of Representatives Committee on Agriculture’s Subcommittee on Nutrition, Greg Mills presents research findings on participant churning in the Supplemental Nutrition Assistance Program (SNAP) including the rates, causes and costs of participant churn in SNAP, which occurs when households receiving SNAP exit the program and then re-enter within several months. Findings include that churn rates across the six states that were studied range from 17 to 28 percent for FY 2011 and that the causes of churn are due primarily to procedural difficulties experienced by participants rather than fluctuations in the earnings of SNAP recipients.