The author proposed a hypothetical model of change, the adaptive change model (ACM), to advance the current conceptualization and operationalization of the transtheoretical model of change (TTM; D. Grimley, J. Prochaska, W. Velicer, M. Blais, & C. DiClemente, 1994; J. Prochaska, 1979; J. Prochaska & C. DiClemente, 1984). He used exploratory factor analysis to identify items contributing to 2 se...