The 1994 study of WIC program and participant characteristics (PC94), like the 1992 study (PC92), is substantially different from earlier efforts to collect data on WIC participants. PC94 employs the prototype reporting system which was developed by FNS for the 1992 study and which routinizes the collection of participant information from state WIC agencies. Earlier FNS studies of the WIC program in 1984 (PC84), 1988 (PC88), and 1990 (PC90) were based on nationally representative samples of WIC participants and programs. PC94, like PC92, contains information on a near-census of WIC participants in April 1994.