To assist nutrition educators in their use of relevant research, FNS conducted a review of studies on: Message framing, Use of interactive technology to tailor messages, and Intervention intensity. The review was intended to document how these specific features of nutrition messages and interventions influence the likelihood of promoting more healthful food choices.

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.