Bridging mental health research and practice: the role of human-centered design in fidelity

Fidelity measurement is critical to ensuring that mental health interventions are delivered as intended and achieve meaningful outcomes. However, conventional fidelity tools often face challenges in real-world mental health settings, including limited usability, high resource demands, and poor contextual fit. Human-centered design (HCD) offers a promising, participatory approach to developing pragmatic fidelity tools that are usable, acceptable, and sustainable. HCD emphasizes empathy, co-creation, iterative testing, and stakeholder engagement—principles that align closely with implementation science priorities in mental health. This mini-review synthesizes current applications of core elements of HCD in fidelity measurement for mental health interventions. Drawing on case examples from youth services, community mental health, culturally adapted programs, and digital health platforms, we illustrate how HCD can enhance tool relevance, promote equity, and support sustained adoption. We also explore tensions in co-design processes, including balancing scientific rigor with adaptability, and managing resource constraints. Despite these challenges, integrating HCD into fidelity work can improve alignment with service realities, increase stakeholder ownership, and ultimately strengthen intervention quality and equity. We recommend embedding HCD principles within implementation frameworks and expanding support for participatory fidelity development. By tailoring fidelity tools to the dynamic contexts of mental health care, HCD can help bridge the gap between evidence and practice and improve mental health outcomes across diverse populations.