This longitudinal study examined five indices of stability and change in Internet addiction: structural stability, mean-level stability, differential stability, individual-level stability, and ipsative stability. The study sample was 351 undergraduate students from end of freshman year to end of junior year. Convergent findings revealed stability rather than change in Internet addiction. Prior academic self-concept was not associated with individual-level stability, profile consistency, and dispersion. As academic self-concept revealed no correlation with individual-level stability and ipsative stability, future research should test the effects of loneliness and depression on individual-level stability, profile consistency, and dispersion in Internet addiction.