This study is a mixed-methods feasibility trial designed to examine whether a universal classroom-based psychoeducational programme which covers unusual sensory experiences, psychosis, mental health stigma, and coping strategies can be delivered in secondary schools in Northern Ireland.

The study aims to determine whether the programme is feasible to deliver, whether students find it acceptable, and whether it is possible to collect questionnaire and reflection data at multiple time points.

Students will attend four classroom sessions delivered by the researcher as part of timetabled enrichment lessons. They will complete questionnaires before the programme, after it ends, and one month later. Brief reflections will also be completed after each session.

A small number of students may take part in an interview to explore their experiences of the programme. As a feasibility study, this trial does not assess intervention effectiveness but will inform the design of a future full-scale trial.

This is a mixed-methods feasibility study to evaluate the delivery, feasibility and acceptability of a universal psychoeducational programme. The intervention aims to build students' mental-health literacy and confidence in recognising and responding to distress. The programme is educational in focus; it is not designed to diagnose, treat symptoms, or identify individuals at clinical risk.

The trial uses a non-randomised parallel-group design in which participating secondary schools are allocated to either the intervention arm or a teaching-as-usual control arm. The intervention comprises four structured classroom sessions delivered within the normal school timetable. Session content includes: (1) understanding mental health and the stress response; (2) understanding unusual sensory experiences and psychosis; (3) understanding stigma and media influences; and (4) understanding thoughts and feelings using cognitive behavioural therapy-informed coping strategies. Sessions use multimedia materials, group discussion, and workbook activities. All content was co-designed with individuals with lived experience of psychosis, mental health professionals, and teachers. Students in the control arm will continue with teaching-as-usual during data collection and will be offered the intervention after the study follow-up period (waitlist).

Quantitive data will be collected at multiple timepoints to assess feasibility including recruitment, retention, data completeness, adherence to planned session components. Students will complete baseline, post intervention and one month follow up questionnaires, as well as brief surveys and reflections after each session to capture engagement and acceptability.

Pre-post changes in key outcomes will be explored descriptively using repeated measures approaches to examine patterns of change and to estimate variance for planning a future definitive trial, where data completeness permits.

Psychotic-like experiences, emotional and behavioural functioning, and help-seeking intentions will be assessed using validated self-report tools. These include the Prodromal Questionnaire-16 (PQ-16), the Strengths and Difficulties Questionnaire (SDQ) and the Mental Help Seeking Intention Scale (MHSIS).

A qualitative component, consisting of semi-structured interviews with a subset of participants will explore experiences of the programme, perceived relevance, acceptability and suggestions for refinement.

The primary purpose of this study is feasibility rather than efficacy. Findings will inform decisions about progression to a future trial, including necessary refinements to content, delivery and evaluation procedures.

Inclusion Criteria:

• Students aged 16-18 years enrolled in participating secondary schools in Northern Ireland.
• Able to provide informed consent in accordance with the approved ethics protocol.

Exclusion Criteria:

• Students who decline consent or whose parent/carer opts them out, where applicable.