“…Complex Dynamic Systems Theory has been proposed and used to describe developmental processes (e.g., van Geert, 2008 ; Spoelman and Verspoor, 2010 ; Verspoor et al, 2017 ; Larsen-Freeman, 2018 , 2019 ; Lowie et al, 2018 ) and variability (e.g., van Geert and van Dijk, 2002 ; Larsen-Freeman, 2006 , 2017 ; Polat and Kim, 2014 ; Lowie and Verspoor, 2015 , 2018 ) in L2 learning in a number of recent SLA studies, proposing non-linear development of overweight cause-effect relationships, and emphasizing that disordered details and dynamic changes can be indicators of development ( Larsen-Freeman and Cameron, 2008 ; Verspoor et al, 2008 , 2017 ; van Dijk et al, 2011 ).…”