The Institutional Integration Scale is claimed to measure five facets of college student academic and social integration. The scale was based on Tintos model of college student withdrawal. Psychometric properties of the scale were examined based on a sample of 1st-year college students. These results led to item revisions and additions. The scale was administered to a second sample of 1st-year college students. The final 34-item instrument showed improved psychometric properties. The revised scale scores had satisfactory internal consistency reliability and intercorrelations among the subscales and with the total scale. Confirmatory factor analysis revealed that the original theoretical model may be problematic. Revisions to the model resulted in improved fit.