“…Policy integration is a political process that entails the coordination of actors and agencies across policy subsystems, the combination of instruments from different policy sectors, as well as arrangements for their consistent implementation and evaluation, as a response to a complex policy problem that not one policy sector, policy instrument, or agency can solve (Candel & Biesbroek, 2016 ; Cejudo & Michel, 2017 ; Trein et al, 2021a , 2021b ). This understanding has stimulated a growing strand of research in the policy sciences (Tosun & Lang, 2017 ; Trein et al, 2019 ), which has (re)discovered the importance of questions dealing with new and transversal policy goals when facing complex challenges, such as environmental protection, climate change, public health, gender equality, and migration, from established policy subsystems (Adelle & Russel, 2013 ; Daly, 2005 ; Ingold & Tosun, 2020 ; Jordan & Lenschow, 2010 ; Metz et al, 2020 ; van Breugel & Scholten, 2017 ; Varone et al, 2013 ).…”