Information has been lacking as to what characterizes families who show low nutritional knowledge regarding proper foods for their diets, and what characterizes those families who tend to increase in knowledge the most as a result of the Expanded Food and Nutrition Extension Program. This study provides such information. Its purpose was to determine the influence of selected personal and family characteristics of homemakers enrolled in the program on change in their knowledge of the four food groups. The population included homemakers enrolled at least six months in the program, from 10 original program counties; a total of 397 families were included in the study. Data were obtained from family record forms secured from the Extension offices. A five-page summary of the findings is presented, and a three-page table summarizes significant relations between homemakers' knowledge of foods in each group and each independent variable. (AJ)