Researchers analyzed data from a national sample of American School Counselor Association (ASCA) members practicing in elementary, middle, secondary, or K-12 school settings (N = 4,598) to test the underlying structure of the School Counseling Program Implementation Survey (SCPIS). Using both confirmatory and bifactor analyses, results suggested that a three-factor model had the best fit for the data. The SCPIS provides practicing school counselors, state and district leaders, counselor educators, and researchers with a psychometrically sound measure of ASCA National Model implementation.