The STEM-ecosystem project investigates how scholars can inform school leaders to develop schools’ social capital to achieve greater educational STEM outcomes in a global and complex world - STEM stands for Science, Technology, Engineering and Mathematics. The project builds on important contributions to the field of social network theory, social capital and educational management such as Liou et al., 2020; Díaz-Gibson, Daly, Balslev & Civís, 2020; Civís, Díaz-Gibson, López & Moolenaar, 2019; Balslev and Daly 2020.Therefore, taking into account the importance of social capital in schools as a mediator to achieve greater educational outcomes in a complex post COVID-19 scenario we pose our two initial hypothesis the project: Schools that have greater social capital, meaning that are well socially connected and have strong social ties both internally (strong social ties between all school actors as students, teachers, families, leaders and staff) and externally (strong social ties between school and educational community resources as museums, libraries, sports facilities, health facilities, educational entities, neighborhood shelters, and so on) first (H1)- develop greater resilient climates, defined as collaborative and innovation climates; and second (H2)- achieve greater educational outcomes regarding STEM-subjects, defined as less dropout rates and higher rates of school achievementThe project investigate primary and lower scondary education in a national Danish setting