One of Equal-Life’s goals is to develop a toolbox for stakeholders. It helps them to understand the project results, the underlying data, and to support future assessments how early exposures to physical and social conditions may affect children's development and mental health. Recommendations for policy and interventions will also be part of the toolbox. To support the use of the toolbox, a guidebook is developed to guide the user through its contents. Together, this will provide a basis for new policies in the domain of physical and social environment to positively – rather than negatively – impact the cognitive development and mental health of children.