Future Directions in Youth and Family Treatment Engagement: Finishing the Bridge Between Science and Service.

The field has spent more than 50 years investing in the quality of youth mental healthcare, with intervention science yielding roughly 1,300 efficacious treatments. In the latter half of this period, concurrent efforts in implementation science have developed effective methods for supporting front-line service organizations and therapists to begin to bridge the science to service gap. However, many youths and families still do not benefit fully from these strategic investments due to low treatment engagement: nearly half of youths in need of services pursue them, and among those who do, roughly another half terminate prematurely. The negative impact of low engagement is substantial, and is disproportionally and inequitably so for many. We contend that to build a robust and "finished" bridge connecting science and service, the field must go beyond its two historical foci of designing interventions and preparing therapists to deliver them, to include an intentional focus on the youths and families who participate in these interventions and who work with those therapists. In this paper, we highlight the significance of treatment engagement in youth mental healthcare and discuss the current state of the literature related to four priorities: conceptualization, theory, measurement, and interventions. Next, we offer an example from our own program of research as one illustration for advancing these priorities. Finally, we propose recommendations to act on these priorities.