Assertive community treatment (ACT) is an evidence-based practice that, although originally developed 40+ years ago, remains relevant for today's mental health system of care.  Lorna Moser, Ph.D., who is the co-developer of the Tool for Measurement of ACT (TMACT), will provide an overview of ACT research, which includes the cost-effectiveness of this model.  She will also provide an overview of the relevance of program fidelity, the components of high-fidelity ACT practice, and common strategies and challenges to high-fidelity ACT implementation.  The last 30 minutes of this 2-hour webinar will be reserved for a Q&A with the audience.