“…However, considering that mHealth intervention efficacy is mixed (Hutton et al, 2020; Kaner et al, 2017; Kazemi et al, 2017) and that this may be due, at least in part, to reduced participant attention and engagement (Lewis & Neighbors, 2015), counselor time allocated to delivering synchronous text-based interventions may be a worthwhile investment. Future research is required to explicitly evaluate how CoAST delivery impacts participant engagement and retention compared to fully automated (text message or web-based), telephone (IVR or one-on-one), videoconference (Celio et al, 2017; King et al, 2020; Lee et al, 2021), and in-person BMIs. Lastly, future research should also seek to understand the impact of these various modes of delivery on intervention utilization, costs, and efficacy outcomes by comparing equivalent content across in-person, videoconference, guided synchronous text-based systems (e.g., CoAST), and fully automated intervention approaches.…”