“…To the developmental psychologist this complex systems perspective may appear as old ideas parading as new ones: Many of the metaphors and models inspired by complexity science were introduced several decades ago to describe developmental processes as self-organizing, interaction dominant and multicausal (e.g., Cicchetti & Tucker, 1994;Lewis, 1995), for example, in the context of the dynamic systems approach to the development of cognition and action (Thelen & Smith, 1994;van Geert, 1991), Ecological Systems Theory (EST; Bronfenbrenner, 1992) and its successors, such as the Phenomenological version of EST (Hall et al, 2022;Spencer et al, 1997). These and other developmental scientists have consistently emphasized the importance of taking the dynamical, multifactorial, and idiosyncratic nature of (the development of) human behavior into account and phenomena such as person-environment interactions, resilience, and feedback loops, are now more generally considered powerful explanatory vehicles in theories of human behavior and cognition (Heino et al, 2021;Masten et al, 2021;van Geert, 2019).…”