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Background IMPROVE aims to conduct a hybrid type 3 evaluation design to test the effectiveness of bundled implementation strategies on intervention fidelity of the Healthy School Start (HSS) program, while simultaneously monitoring effects on health outcomes of children and parents. The HSS is a 4-component family support program for children starting school (5–7 years of age) promoting healthy dietary habits and physical activity in the home environment to prevent childhood obesity and parents’ risk of developing type 2 diabetes. Methods IMPROVE is a cluster-randomized controlled trial with two arms to evaluate and compare the effects of two different bundles of implementation strategies on intervention fidelity expressed as adherence and responsiveness at 12 and 24 months (primary outcomes). Thirty schools in two municipalities will participate in the study reaching about 1400 families per school year. In stakeholder workshops, key implementation determinants were identified according to the domains of the Consolidated Framework for Implementation Research. Through a consensus process with stakeholders, two bundles of implementation strategies were tailored to address context-specific determinants. Schools randomly assigned to group 1 will receive bundle 1 (Basic) and group 2 will receive bundle 1 + 2 (Enhanced). Bundle 2 consists of external facilitation, fidelity monitoring and feedback strategies. Secondary outcomes will include change in acceptability, appropriateness, feasibility, and organisational readiness as perceived by school staff. In addition, child weight status and diet, and parents’ feeding practices and risk of type 2 diabetes will be monitored. Linear and ordinal regression analysis will be used to test the effect on the primary and secondary outcomes, taking clustering and covariates into consideration where needed. Process evaluation will be conducted through key stakeholder interviews to investigate experiences of the program and perceptions on sustainability. Discussion This systematic approach to investigating the effectiveness of two different bundles of implementation strategies tailored to context-specific determinants on the fidelity of the HSS intervention will provide new insight into feasible implementation strategies and external support needed for the HSS to be effective and sustainable. Results will help inform how to bridge the gap between the research on school-based health programs and routine practice in schools. Trial registration Registered prospectively at ClinicalTrials.gov ID: NCT04984421, registered July 30, 2021

The garbage management project "Christmas Duck" which is meant realized within the ecological experimental area in Halkaer Aadal in Denmark is meant to change people’s behaviour into being more sustainable in order to increase consistency between economy and ecology and to contribute to a sustainable society in Halkaer Aadal. The project "Christmas Duck" is analysed from a theoretical point of view, being economics and behavioural theories, as there are both economic and behavioural aspects of the project. The analysis shows that the project "Christmas Duck" can contribute in its way to local sustainability and increased consistency between the ecological and economic system of which we are part, and which determine human behaviour. Implementing the project will make it possible to gain knowledge and gather experience that can be employed elsewhere. The project can also be a dynamo for expanded sustainable behaviour.