Implementing a transdiagnostic sleep and circadian intervention in a community mental health setting: A qualitative process evaluation with community stakeholders

•Transdiagnostic treatments may be a good fit for community mental health settings.•Community stakeholders views on the implementation of TranS-C were evaluated.•Responses were first evaluated using a deductive theory-based process.•A thematic analysis process led to the identification of seven additional themes.•Implications for future implementation are discussed. The implementation of evidence-based psychological treatments (EBPTs) may be particularly challenging to accomplish in community mental health settings for individuals with severe mental illness (SMI). Transdiagnostic treatments, or treatments that target a mechanism that underpins multiple mental health problems, may be particularly well-suited to community mental health settings. This study examines community stakeholder perspectives (N = 22) of the Transdiagnostic Sleep and Circadian Intervention (TranS-C) implemented in a community mental health setting in the context of a randomized controlled trial of TranS-C for SMI. The present study aimed to identify barriers and facilitators to the implementation of TranS-C for SMI in a community mental health setting using (1) a deductive theory-based process based on the Framework for Dissemination in Health Services Intervention Research and (2) an inductive thematic analysis process. All deductive themes were identified as both barriers and facilitators to the implementation of EBPTs and TranS-C in this community mental health setting. Seven additional themes were identified through the inductive thematic analysis. A discussion of how the findings are related to prior research, other EBPT implementation, and future TranS-C implementation are included.