The Food Stamp Program (FSP) helps needy families purchase food so that they can maintain a nutritious diet. Families are eligible for the program if their financial resources fall below certain income and asset thresholds. However, not all eligible families participate in the program. Some choose not to, while others do not know they are eligible. The participation rate—the ratio of the number of participants to the number of eligibles—reveals the degree to which eligible families participate.

The number of people receiving food stamps fell by over 5.9 million between summer 1994 and summer 1997, with most of the decline occurring in the year between September 1996 and September 1997. This decline occurred during a period of strong economic growth – unemployment fell, inflation stayed low, and the percentage of Americans living in poverty fell slightly. In the same period, Congress enacted and states implemented sweeping reforms to the Food Stamp Program and to the nation’s welfare programs.

This report reviews recent approaches to estimating the numbers of persons eligible for and participating in WIC. It also describes issues concerning these estimates that may be worthy of review and synthesizes research on these issues.