Evidence (MOT)

Simpson, D. D., & Joe, G. W. (1993). Motivation as a predictor of early dropout from drug abuse treatment. Psychotherapy, 30(2), 357-368.  [Abstract]

Knight, K., Holcom, M., & Simpson, D. D. (January, 1994). TCU Psychosocial Functioning and
Motivation Scales: Manual on Psychometric Properties
. Fort Worth: Texas Christian University, Institute of Behavioral Research. Manual available as PDF [PDF; 135 KB; 43 pages].