The Motivational Interviewing Skills Code (MISC) has been developed to measure motivational interviewing skill, but a need has been identified for more economical instruments. This study expands on a previous systematic review by Madson and Campbell (2006) and examines the extent to which motivational interviewing integrity measures other than the MISC have been developed and psychometrically tested. Seven studies were reviewed that tested 5 such measures: the Motivational Interviewing Process Code (MIPC), the Motivational Interviewing Supervision and Training Scale (MISTS), the Motivational Interviewing Treatment Integrity Code (MITI), the Behaviour Change Counselling Index (BECCI), and the Video Assessment of Simulated Encounters (VASE). Although these instruments are promising, further psychometric testing is required and current findings should be judged as preliminary. Furthermore, external validity criteria and additional information that would facilitate consumer decision making are lacking. Recommendations for further development and research on these instruments and training studies generally are provided. (Contains 1 figure and 5 tables.)