Table 3 Feasibility dimensions, questions, measures and progression criteria for Phases 2 and 3^a

Recruitment capability

Can participants who will benefit from and who will implement intervention be identified?

• Recruitment and participation rates of students and teachers

• Recruitment rates of canteen vendors^a

• ≥ 50% consent rates

• ≥ 50% of consented participants attended the lessons

• ≥ 50% consent rates from canteen vendors^a

Data collection procedures

Are data collection procedures and outcome measures appropriate and sensitive to change?

• Survey completion rates among students and teachers

• Descriptive analysis of scores from outcome measures

• Survey completion rates among parents

• ≥ 50% of consented participants completed the survey

• Survey questions and scales are appropriate without a ceiling effect

• ≥ 50% of consented parents completed the survey

Social validity

Do participants perceive the intervention as appropriate, reasonable, fair, and potentially effective?

• Post-intervention feedback surveys from teachers and students

• Post-intervention FGDs with students and teachers

• Post-intervention interviews with canteen vendors^a

• ≥ 75% satisfaction from student’s and teacher’s feedback surveys

• Positive experiences from students, teachers, and canteen vendors^a

• Positive experiences from canteen vendors^a

Practicality

Can the intervention be implemented with available resources, time, training, and materials?

• Post-intervention FGDs with students and teachers

• Post-intervention interviews with canteen vendors^a

• Number of parent volunteers participated in canteen activities^a

• Good feedback on the resources provided

• Low level of perceived barriers on implementation from teachers and canteen vendors^a

• At least 5 parent volunteers participated in the canteen activities^a

Implementation

Are teachers able to implement the intervention with fidelity (as intended by the research team)?

Are the canteen posters still in place by the end of the intervention?^a

• Teacher-reported implementation checklist

• Class observations^a

• Canteen environmental scans^a

• ≥ 75% fidelity among teachers, based on the checklist

• ≥ 75% fidelity among teachers, based on class observations^a

• ≥ 75% of the posters are still in place at the end of the intervention^a

Potential Effectiveness of the whole PEDAL intervention^a

Is there preliminary evidence of potential for bringing about positive change? What influenced the change (or no change) among the students?^a

• Student outcome data^a

• Canteen environmental scans ^a

• Post-intervention interviews with students and teachers^a

• Post-intervention interviews with canteen vendors^a

• Improvements in fruit and vegetable intakes^a

• Improvements in MVPA min/day^a

• Reduction in screen time min/day^a

• Improvements in ideation factors^a

• Improvements in student’s health-related quality of life^a

• Perceived improvements in behaviour and increased motivation for behaviour change^a