Abstract Background The overarching aim of the Horizon 2020 Equal-Life project is to develop evidence-based guidance for policy-and decision-makers concerning child environment and long-term effects on mental health and cognitive development. Stakeholders at national and local level are crucial in improving the physical and social environments children grow up in. In this paper, we present preliminary results of a repeated survey on stakeholders' needs concerning environmental determinants of mental health and cognitive development of children and adolescents. Methods We invited potential stakeholders from relevant fields of expertise. Two of three rounds of the Delphi survey were performed by means of an on-line survey between November 2020 and February 2021.The questionnaire was aimed at identifying research questions, knowledge gaps and raised issues about data collection and analysis regarding improving mental health and cognitive development, policy needs related to environment and its role in children's mental health and the potential effectiveness of policy interventions. Results and Conclusions In the 1st survey round 34 stakeholders participated and in the 2nd survey round 51 stakeholders participated from 26 different countries and continents. Across both rounds of the survey most participants were from research institutes (21), public health organisations (8), civil society (6), national stakeholders (5) with only little involvement of local or regional authorities or child care organisations. Stakeholders identified several research priorities such as: instruments to improve children's mental health, preventive programs addressing mental health, integrated mental health care services, programs aimed at parenting skills and child care. Early life exposure to adverse social events and psychosocial stressors in the family and socioeconomic disadvantage were recognized as main factors for child development. Key messages The guidance from Equal-Life aims to include stakeholders in creation of intervention strategies and preventive measures for mental health and the cognitive development of children. Evidence-based policies and programmes can buffer the negative effects of adverse environments and create restorative ones, and by doing so improve mental health and cognitive development.
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