Formative work: March 2023 – March 2025

• Scoping review
• Stepped-wedge design phase 1
• Scoping interviews
• Stepped-wedge design phase 2
• Embedded research
• School survey
• Co-design workshops

Pilot: October 2024 – December 2025

• Tool design and use
• Intervention delivery
• Data collection

Stepped-wedge trial: January 2026 – October 2027

• Planning and recruitment
• Stepped-wedge trial
• Evaluation