Motivational interviewing quality assurance: A systematic review of assessment tools across research contexts.

The need for sustained skill development and quality assurance when executing behavioral interventions is best demonstrated in the empirical evolution of Motivational Interviewing (MI). As a brief behavioral intervention that identifies the therapeutic process as an active treatment ingredient, it is critical for researchers, trainers, and administrators to use psychometrically sound and theoretically congruent tools to evaluate provider skills and fidelity when executing MI. Yet, no prior work has evaluated the breadth of MI tools employed across research contexts. Therefore, this review identified MI fidelity and skill development tools across measurement, training and efficacy/effectiveness studies and evaluated their psychometric strength and fit with current MI theory. We identified 199 empirical studies that employed an MI fidelity/skill tool and we found 21 tools with varying degrees of empirical support and theoretical congruence. Specifically, we identified five observer-, two trainee- and one client-rated tool with strong empirical support, and nine observer- and two client-rated tools with preliminary empirical support. We detailed the empirical strength, including the extent to which tools were linked to trainee/client outcomes across research contexts and offer recommendations on which MI tools to use in training, efficacy, and effectiveness trials.