Teachers and Teenagers Build a Mental Health Program That Lives Inside Ordinary Lessons

Every classroom holds an invisible workload. Alongside the curriculum, teachers absorb the emotional weather of thirty young people at a time, and the rising tide of anxiety, low mood, and distress among adolescents has turned that weather increasingly stormy. A new study published in PLOS One describes a deliberately practical response: rather than bolting a mental health program onto an already crowded school day, researchers worked with teachers and teenagers to build psychological support directly into the lessons that happen anyway. The intervention, called the Child and Adolescent Mentally Healthy Classroom intervention, or CAMH Class, was co-developed from the ground up by the people who would actually have to live with it, and the early evidence suggests that this approach may solve one of the most stubborn problems in school-based mental health research, namely what happens after the researchers leave.

The rationale behind the project rests on a well-documented gap. Schools are widely recognized as one of the best settings for promoting young people’s mental health, because they reach nearly every child regardless of family circumstances, and because the classroom is where much of adolescent life is actually lived. Yet most evidence-based interventions fail to survive the transition from clinical trial to routine practice. Programs designed by specialists often demand resources schools do not have, clash with teacher preferences, or simply feel alien to the students they are meant to help. The team behind CAMH Class, led by Tracy M. Stewart of the University of Edinburgh with colleagues including Gillean McCluskey, Debi Fry, Lesley McAra, and Josie N. Booth, set out to reverse that engineering order: start with the constraints of real classrooms and design the intervention to fit them, rather than expecting classrooms to bend around an intervention.

The design philosophy is explicitly transdiagnostic. Instead of targeting a single diagnosis such as depression or anxiety, transdiagnostic interventions address the shared underlying processes that cut across multiple forms of distress, such as emotional regulation, coping strategies, and social connection. This matters for schools because young people rarely present with neat diagnostic categories, and because a program that requires referral pathways or specialist screening creates bottlenecks that many institutions cannot sustain. A transdiagnostic, universal approach delivered to whole classes can promote wellbeing and prevent the onset or escalation of symptoms simultaneously, without singling anyone out, which also reduces the stigma that keeps many adolescents from engaging with mental health provision at all.

The development process itself was structured and sequential. In total, 32 participants aged between 15 and 63 took part, with a mean age of 32.72 years, organized into three distinct groups. The first group consisted of teachers, with a mean age of 36.80, who participated in four sequential development workshops. These workshops were the engine room of the project, where teachers identified the mental health priority areas most relevant to their classrooms and began shaping activities that could be woven into ordinary teaching. A second group, young people with a mean age of 15.85, attended a dedicated development workshop, ensuring that the student voice was not filtered entirely through the perspectives of adults. Finally, a fresh group of teachers who had played no part in the initial design took part in a refinement workshop, with a mean age of 37.38, providing an independent check on whether the emerging intervention made sense to people encountering it for the first time.

This layered structure reflects a core principle of co-production research: the people who deliver and receive an intervention hold knowledge that outside experts cannot replicate. Teachers know the rhythm of a school week, the practical limits of a fifty-minute lesson, the topics that will land with a particular year group, and the difference between an activity that sounds good on paper and one that works with a restless class on a Friday afternoon. Young people know what feels patronizing, what feels authentic, and what they would actually be willing to engage with in front of their peers. By bringing both groups together, the researchers aimed to produce something that neither could have designed alone, and to build a sense of ownership that increases the chances the intervention will be used long after any formal evaluation ends.

The workshops yielded a set of classroom activities mapped onto the priority areas that teachers and young people identified together. The key innovation is not any single exercise but the delivery mechanism: every activity is designed to be integrated directly into routine teaching, so that supporting mental health becomes part of how a lesson is taught rather than an additional subject competing for timetable space. This embedded approach addresses the single most common reason school interventions collapse, which is that they require dedicated time, trained external facilitators, or funding streams that evaporate. If the intervention lives inside ordinary pedagogy, its marginal cost approaches zero, and its sustainability no longer depends on grant cycles or the enthusiasm of a single champion within a school.

The feasibility findings are encouraging, though appropriately qualified. Both teachers and young people judged the intervention feasible and acceptable, but subject to contextual considerations, a phrase that carries real weight in implementation science. What works in one school may falter in another depending on leadership support, staff workload, class composition, and the wider culture of the institution. The researchers did not treat this context-dependence as a flaw to be engineered away; rather, the co-development process was explicitly designed to surface these contextual factors early, so that schools adopting the intervention can adapt it intelligently rather than discarding it when the first obstacle appears. That flexibility is characteristic of interventions built for the messy reality of public education rather than the controlled conditions of a trial.

Teachers who engaged with the activities reported observations that go beyond mental health narrowly defined. They perceived a positive impact on young people’s engagement, learning, energy, and overall enjoyment in class, alongside the intended benefits for wellbeing. This is a significant detail, because teachers are asked to invest their own effort in any classroom-based program, and an intervention that improves the experience of teaching, not just the outcomes for students, is far more likely to be sustained. It also hints at a virtuous cycle familiar from the broader literature on social and emotional learning: classrooms where students feel emotionally supported tend to be calmer and more productive, which in turn reduces stress for teachers, which further improves the emotional climate. CAMH Class appears positioned to exploit that feedback loop deliberately.

The study, published in December 2026, represents the development phase of a longer research program, and the authors are careful about what it does and does not establish. What it demonstrates is that co-production can produce a school-based mental health intervention that teachers and young people genuinely accept, that fits within routine teaching, and that targets transdiagnostic processes relevant to a wide range of outcomes. What remains to be tested, in future evaluation phases, is whether the intervention produces measurable and lasting improvements in mental health symptoms at scale. Even so, the translation problem it addresses is arguably the field’s most urgent challenge. Reviews of school-based mental health research repeatedly find effective programs that never reach the classrooms that need them, because the programs were never designed for routine conditions in the first place.

The broader significance of the work lies in its method as much as its product. If CAMH Class succeeds in subsequent trials, the template it offers, sequential workshops with teachers, a dedicated youth workshop, and independent refinement by fresh stakeholders, could be applied to interventions across education, public health, and beyond. The study’s authors describe their co-production approach as having the potential to bridge the gap in intervention translation to the classroom and ultimately benefit young people’s mental health. At a moment when adolescent mental health services are stretched thin across much of the world, the idea that prevention might be built into the ordinary fabric of the school day, at minimal cost and with the endorsement of the people in the room, is a proposition worth taking seriously. The classroom, this research suggests, may be the most underused mental health resource in the country, and the people best placed to unlock it were there all along.

Subject of Research: Co-development of a transdiagnostic, classroom-embedded mental health intervention for secondary schools

Article Title: Co-developing the Child and Adolescent Mentally Healthy Classroom (CAMH Class) intervention for use in routine teaching in secondary schools

Article References: Stewart, T. M., McCluskey, G., Johnson, H., Fry, D., McAra, L., & Booth, J. N. (2026). Co-developing the Child and Adolescent Mentally Healthy Classroom (CAMH Class) intervention for use in routine teaching in secondary schools. PLOS One, 21(10), e0359563. https://doi.org/10.1371/journal.pone.0359563

Image Credits: AI Generated

DOI: 10.1371/journal.pone.0359563

Keywords: adolescent mental health, school-based intervention, co-production, transdiagnostic, classroom, teachers, PLOS One, feasibility, prevention, wellbeing, secondary schools, intervention development