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This article presents the findings of a case study undertaken with the year 5 girls in one school to investigate their experiences and understanding of covert intimidation, as well as the effects and impact of these practices in the school setting. The findings of the study were obtained from the analysis of interviews, researcher-generated documents (worksheets) and surveys. They suggest that covert intimidation does exist in the school setting, and more particularly that these practices are an integral part of relationships between girls, through which they resolve the anger and conflict that arise in their friendships. These practices are located in the heart of girls' relationships and operate beneath the surface of ordinary school life. The conclusion of the study is that the term relational aggression should be used as a descriptor to help bring the phenomenon of covert aggression into the open. Open acknowledgment of these practices will help address these behaviours between girls so that they can learn open and honest ways of relating to each other, particularly in the resolution of their conflicts. (Contains 1 table.)

Introduction: Promoting healthy eating and active play in early life is critical, however few interventions have been delivered or sustained at scale. The evaluation of interventions at scale is a crucial, yet under-researched aspect of modifying population-level health behaviours. INFANT is an evidence-based early childhood healthy lifestyle intervention that aims to improve parents' knowledge and skills around promoting optimal energy balance-related behaviours that, in turn, influence children's diet, activity and adiposity. It consists of: 1) Four group sessions delivered via first time parent groups across the first 12 months of life; 2) access to the My Baby Now app from birth to 18 months of age. This research aims to assess real-world implementation, effectiveness and cost-effectiveness of INFANT when delivered at scale across Victoria, Australia. Methods and Analysis: A hybrid type II implementation-effectiveness trial applying a mixed methods design will be conducted. INFANT will be implemented in collaboration with practice and policy partners including maternal and child health services, population health and Aboriginal health, targeting all local government areas (n=79) in Victoria, Australia. Evaluation is based on criteria from the 'Outcomes for Implementation Research' and 'RE-AIM' frameworks. Implementation outcomes will be assessed using descriptive quantitative surveys and qualitative interviews with those involved in implementation, and include intervention reach, organisational acceptability, adoption, appropriateness, cost, feasibility, penetration and sustainability. Process measures include organizational readiness, fidelity, and adaptation. Effectiveness outcomes will be assessed using a sample of INFANT participants and a non-randomized comparison group receiving usual care (1,500 infants in each group), recruited within the same communities. Eligible participants will be first time primary caregivers of an infant aged 0-3 months, owning a personal mobile phone and able to communicate in English. Effectiveness outcomes include infant lifestyle behaviours and BMIz at 12 and 18 months of age. Impact: This is the first known study to evaluate the scale up of an evidence based early childhood obesity prevention intervention under real world conditions. This study has the potential to provide generalisable implementation, effectiveness and cost-effectiveness evidence to inform the future scale up of public health interventions both in Australia and internationally. Clinical Trial Registration: Australian and New Zealand Clinical Trial Registry https://www.anzctr.org.au/ , identifier ACTRN12620000670976. [ABSTRACT FROM AUTHOR]