Resource | Research | Assessing/Improving Operations
WIC Vendor Peer Group Study

The purpose of this study is to evaluate the effectiveness of State Agencies current peer group systems, and to provide guidance to State Agencies on how to evaluate and update their systems. Specifically, it uses empirical analysis to identify one or more effective models for establishing vendor peer groups that could apply to most State Agencies.

Resource | Policy Memos | 2013-4
OIG Hotline Information on WIC Food Instruments
Resource | Research
2013 WIC Vendor Management Study

This study is part of a larger FNS effort to ensure WIC program integrity and to comply with the Improper Payments Information Act of 2002 (IPIA) (Public Law 107-300), which requires FNS to estimate improper payments (IP) in its programs.

Resource | Research | Payment Accuracy and Program Integrity
WIC Erroneous Payments to Vendors: Annual Estimates for FY 2011

This report provides improper payment estimates for fiscal year (FY) 2011 using a methodology for “aging” the 2005 bookend study. The methodology yields nationally representative estimates of the number of vendors that over- and undercharged and the amount of over- and undercharges across all WIC vendors.

Resource | Research | Payment Accuracy and Program Integrity
WIC Erroneous Payments to Vendors: Annual Estimates for FY 2010

This report provides improper payment estimates for FY 2010 using a methodology for “aging” the 2005 bookend study. The methodology yields nationally representative estimates of the number of vendors that over- and undercharged and the amount of over- and undercharges across all WIC vendors.

Resource | Research | Payment Accuracy and Program Integrity
WIC Erroneous Payments to Vendors: Annual Estimates for 2009

This report provides improper payments estimates for FY 2009 using a methodology for “aging” the 2005 bookend study. This updates previous reports providing estimates from 2005 to 2008.

Resource | Research | Payment Accuracy and Program Integrity
Improper Payments to WIC Vendors 2005-2008

About every 7 years, FNS performs a nationally representative study (called a bookend study1) to examine the extent of error and abuse among food vendors authorized to accept WIC vouchers. The last bookend study was the 2005 WIC Vendor Management Study, which used fiscal year (FY) 2005 expenditure data to derive an estimate for 2004. Between bookend studies, there is a need to derive annual estimates of the level of improper payments for compliance with the Improper Payments Information Act of 2002. The purpose of the subsequent annual studies was to provide annual updates to the bookend studies using the developed aging methodology.

Resource | Research | Participation Characteristics
National Survey of WIC Participants II

This report, the first of three, addresses the first objective of the study, which is to explore the characteristics and experiences of WIC participants.

Resource | Research | Payment Accuracy and Program Integrity
2005 WIC Vendor Management Study

The Special Supplemental Nutrition Program for Women, Infants and Children (WIC) serves low- income pregnant, breastfeeding, or postpartum women, and infants and children up to age 5 who are at nutritional risk. In almost all States, the Program provides eligible recipients with vouchers that can be used at authorized stores—referred to as vendors. The 46,000 authorized vendors are mostly grocery stores and pharmacies which have signed agreements to follow program rules. In 1991 and 1998, FNS conducted national studies of WIC vendors to determine the extent of vendor violation of program rules. After the 1998 study, FNS issued regulations to correct vendor practices. The 2005 study replicates the 1998 study to determine whether the regulations were effective, and to measure the frequency of vendor violations and the degree to which vendors charge accurate prices for WIC transactions. It also provides data on payment error as required by the Improper Payments Information Act (IPIA) of 2002 (P.L. 107-300).