Mental illness and co-occurring disorders can influence the length of time in establishing a trusting therapeutic relationship. Assertive engagement involves the use of interpersonal skills and inventiveness to engage clients and interest them in subsequent care. It entails taking multidisciplinary services directly to the people in encampments, streets, sidewalks, alleyways, schools, and other public spaces, followed by the provision of ongoing support. This training will cover assertive engagement strategies that are most helpful with adult clients with mental illnesses that may include co-occurring substance use disorders. Strategies will include evidence-informed modalities (motivational interviewing, harm reduction, strengths-based), informal or creative approaches, as well as opportunities for learners to apply these strategies using case vignettes. The intended audience for this training is field-based community mental health providers and outreach workers. Anytime session recorded on July 21, 2023.