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Cogn Behav Ther. 2008;37(3):183-91. doi: 10.1080/16506070802091171.

A test of the validity of the motivational interviewing treatment integrity code.

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Department of Clinical Neuroscience, Division of Addiction Research, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden.


To evaluate the Swedish version of the Motivational Interviewing Treatment Code (MITI), MITI coding was applied to tape-recorded counseling sessions. Construct validity was assessed using factor analysis on 120 MITI-coded sessions. Discriminant validity was assessed by comparing MITI coding of motivational interviewing (MI) sessions with information- and advice-giving sessions as well as by comparing MI-trained practitioners with untrained practitioners. A principal-axis factoring analysis yielded some evidence for MITI construct validity. MITI differentiated between practitioners with different levels of MI training as well as between MI practitioners and advice-giving counselors, thus supporting discriminant validity. MITI may be used as a training tool together with supervision to confirm and enhance MI practice in clinical settings. MITI can also serve as a tool for evaluating MI integrity in clinical research.

[Indexed for MEDLINE]

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