This article advances the literature on assessment of EFNEP's effectiveness. Factor analysis of Behavior Checklist items were performed to arrive at a parsimonious set of constructs used to assess the effects of program attributes on participants' behavior change. Based on the data from Michigan EFNEP, the use of constructs demonstrated a robust method of assessing program effectiveness. The greatest behavior changes were with participants taught by program assistants with fewer than 2, 2-5, or more than 15 years of experience. Hispanic participants reported higher levels of behavior changes, as did participants who received EFNEP curriculum in a one-on-one setting. (Contains 1 figure and 5 tables.)