Assessing the effectiveness of methods to recruit schools to an app-based nutrition program.

Interventional A randomised design will be utilised to test the effectiveness of methods to recruit schools to the SWAP IT program, an app-based nutrition program aimed at improving what is packed in lunchboxes. The trial will assess whether recruitment via Skoolbag, the app provider, is more effective than the usual recruitment methods via Health Promotion Officers employed through the state health department. All Schools in the target sample are existing users of Skoolbag, a school to parent communication app. Schools will be randomly allocated to either the intervention arm, recruitment via Skoolbag; or control arm, recruitment via usual methods. The trial will run for approximately 4 weeks. The intervention group will receive an initial email and up to two follow up emails over a 4 week period, from Skoolbag, inviting participation in the SWAP IT program. The emails contain a link to complete an expression of interest form and a flyer outlining the SWAP IT program. The invitation emails will be sent from Skoolbag head office to their usual contact at the schools. A list of participating schools, timing and content of the emails will be provided to Skoolbag by the Trial Principal Investigator or his delegate.