Conclusion
depression, anxiety
The study outcomes show that mental health interventions such as the one developed by MENTUPP have the potential to improve mental wellbeing, anxiety symptoms and stigma towards depression and anxiety. Importantly, this study contributes to the limited empirical evidence available for SMEs which is an underexplored field in literature (Hogg et al. Τhe outcomes targeted by MENTUPP remain the same for the cRCT and we defined valid and feasible assessment for our complex intervention. Our ToC itself has been optimized and will provide guidance not only to the MENTUPP trial but also to the development, implementation and evaluation of future projects of high complexity. This way, our study adds to the evidence required to conduct high-quality evaluations (Paterson et al. 