Background Contingency management (CM) is the most effective treatment for stimulant use disorder but is underutilized by opioid treatment programs (OTPs), despite the high prevalence of stimulant use in this setting. As part of a state-wide initiative, we piloted a novel assessment, the Inventory of Factors Affecting Successful Implementation and Sustainment (IFASIS), to examine determinants of implementation of a digital CM platform across a set of OTPs. We describe how the IFASIS was used to elucidate both generalizable and context-specific implementation determinants, and to guide the provision of implementation facilitation. Methods Six OTPs received a multi-level implementation strategy (including facilitation) to promote programmatic uptake of a digital CM platform. Pre-implementation, OTPs completed the IFASIS, a 27-item questionnaire that assesses both the valence (positive/negative) and importance of determinants across 4 domains: outside the organization, within the organization, about the intervention, and about intervention recipients. OTP staff completed the IFASIS as a team, identifying consensus ratings during recorded discussions. Transcripts of IFASIS recordings were analyzed using rapid qualitative analysis. Quantitative IFASIS results were aggregated into medians and ranges within and across organizations. Implementation facilitation meeting notes were analyzed to examine how the IFASIS was used to guide facilitation. Results Quantitative ratings and qualitative feedback revealed common barriers to implementation of the digital CM platform, including a lack of sustainable funding sources, absence of external and organizational policies, insufficient higher-level leadership support, and mixed attitudes among staff members toward CM. Common implementation facilitators included enthusiasm and commitment among organization leadership and the perception that the digital CM platform would reduce the workload and burden on OTP counselors. The IFASIS was used to guide facilitation in several ways, including stimulating discussion about barriers and facilitators, brainstorming strategies to address barriers rated as "very important", and identifying facilitators that could be harnessed as part of implementation efforts. Conclusions The IFASIS identified important determinants of CM implementation in OTPs and was instrumental in shaping facilitation. The IFASIS may be a valuable assessment for the implementation science community to identify and address generalizable and context-specific implementation determinants.
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